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Table of Contents

QSIG Protocol Support on Cisco MC3810, 7200, 2600, and 3600 Series Routers

Feature Overview

Supported Platforms

Supported Standards, MIBs, and RFCs

Prerequisites

Configuration Tasks

Configuration Examples

Command Reference

Glossary

QSIG Protocol Support on Cisco MC3810, 7200, 2600, and 3600 Series Routers

This document describes how to configure QSIG protocol support for Cisco 7200, 2600, and 3600 series routers and enhancements to QSIG protocol support on the Cisco MC3810 multiservice access concentrator.

This feature description includes the following sections:

Feature Overview

QSIG protocol support allows Cisco voice switching services to connect private branch exchanges (PBXs), key systems (KTs), and central office switches (COs) that communicate by using the QSIG protocol, which is becoming the standard for PBX interoperability in Europe and North America. QSIG is a variant of ISDN D-channel signaling. With QSIG, Cisco networks emulate the functionality of the public-switched telephone network (PSTN), and QSIG signaling messages allow the dynamic establishment of voice connections across a Cisco wide-area network (WAN) to a peer router, which can then transport the signaling and voice packets to a second private integrated services network exchange (PINX), as shown in Figure 1.


Figure 1: QSIG Signaling

The Cisco voice packet network appears to the traditional QSIG PBXs as a distributed transit PBX that can establish calls to any PBX, non-QSIG PBX, or other telephony endpoint served by a Cisco gateway, including non-QSIG endpoints. When originating and terminating on QSIG endpoints, the QSIG messages are passed transparently across the network; the PBXs are responsible for processing and provisioning the supplementary services. When linking QSIG and non-QSIG endpoints served by a Cisco packet voice gateway, only basic calls are supported. In addition, all switched voice connections must be established and torn down in response to QSIG control messages.

QSIG support includes the following capabilities:

Figure 2 shows an example of how QSIG support can enable a toll-bypass application.


Figure 2: QSIG Toll-Bypass Application

QSIG Protocol Stack

QSIG is a variant of ISDN D-channel signaling. The protocol was originally specified by ECMA, then was adopted by European Telecommunications Standards Institute (ETSI) and the ISO. The following table identifies that ECMA standards and to which OSI layer they define of the QSIG protocol stack.


Table 1:
Layer Standards Description
Layers 4 to 7

Application mechanisms

End-to-end protocols

Network transparent

Layer 3

Multiple ECMA standards

Standards for Supplementary Services and Advance Network Features

ECMA-165

QSIG Generic Functional Procedures

ECMA-142/143

QSIG Basic Call

Layer 2

ECMA-141

Interface-dependent protocols

Layer 1

I.430 / I.431

PRI and BRI

QSIG Protocol Stack

Switch-Type Configuration Options

Step-by-step configuration procedures are included in "Configuration Tasks". This section includes some tips for configuring the ISDN switch type.

You can enter the isdn switch-type command to support QSIG at either the global configuration level or at the interface configuration level. For example, if you have a QSIG connection on one line as well as on the BRI or PRI port, you can configure the ISDN switch type in one of the following combinations:


Table 2: ISDN CO Switch Types
Country ISDN Switch Type Description

Australia

basic-ts013

Australian TS013 switches

Europe

basic-1tr6

German 1TR6 ISDN switches

basic-nwnet3

Norwegian NET3 ISDN switches (phase 1)

basic-net3

NET3 ISDN switches (UK and others)

vn2

French VN2 ISDN switches

vn3

French VN3 ISDN switches

Japan

ntt

Japanese NTT ISDN switches

New Zealand

basic-nznet3

New Zealand NET3 switches

North America

basic-5ess

Lucent Technologies basic rate switches

basic-dms100

NT DMS-100 basic rate switches

basic-ni1

National ISDN-1 switches

Benefits

QSIG voice signaling provides the following benefits:

Restrictions

The following restrictions apply to the Cisco MC3810:

The Cisco 2600 series does not support VoATM.

The following restrictions apply to the Cisco 7200 series:

Related Documents

The following online documents can help you understand QSIG support:

The following Cisco IOS Release 12.0 documents are also helpful:

The following documents can help you troubleshoot ISDN, PRI, and BRI connections:

The following documents can help with hardware installation and configuration:

Supported Platforms

This feature is supported on the following platforms:

Supported Standards, MIBs, and RFCs

RFCs

MIBs

Other Supported Standards

QSIG is based on the widely used ISDN Q.931 standards. Cisco's QSIG implementation follows the following International standards:

Prerequisites

Configuration Tasks

Perform the following tasks to configure your Cisco 2600, 3600, or 7200 VXR series routers or your Cisco MC3810 multiservice concentrator:

These sections do not include all possible configuration steps. For more information, see the resources listed in "Related Documents".

Configuring Global QSIG Support for BRI or PRI

To complete global configuration of QSIG signaling on the router, follow the steps in this section.

If you need additional guidance regarding switch-type configuration, see "Switch-Type Configuration Options".
Step Command Purpose

1 .  

router# configure terminal

Enter global configuration mode.

2 . 

router(config)# isdn switch-type basic-qsig

or

isdn switch-type primary-qsig

(Optional, BRI only on Cisco MC3810, 2600, and 3600 series routers) Configure the global ISDN switch type.

(Optional, PRI only) Configure the ISDN switch-type to support QSIG signaling.

Note You can configure the ISDN switch type by using either this global command or the same command in interface configuration mode, depending on your configuration. If you configure the global isdn-switch-type command for QSIG support, you do not need to configure the interface isdn-switch-type command for QSIG.

For more information, see "Switch-Type Configuration Options". For a list of CO switch types, see Table 2.

3 .  

router(config)# dspinterface dspfarm slot/port

(Cisco 7200 series only) Configure the digital signal processor (DSP) farm interface.

4 .  

router(config)# card type {t1/e1} slot

(Cisco 7200 series only) Enter T1 or E1 card type and specify the slot location by using a value from 0 to 5, depending upon your router.

Configuring Controllers for QSIG PRI

Beginning in global configuration mode, complete the following steps to configure QSIG signaling over PRI:

1 . 

router(config)# controller {T1 | E1}controller number

Enter interface configuration mode and specify the E1 or T1 controller, specifying 1 for a Cisco MC3810 and a slot/port location on a Cisco 7200, 2600, or 3600 series router.

Note On the Cisco MC3810, QSIG is only supported on controller 1.

2 .  

router(config-controller)# pri-group
{timeslots range}

Configure the PRI group for either T1 or E1 to carry voice traffic. For T1, available timeslots are from 1 to 23, and for E1, available timeslots are from 1 to 31.

You can configure the PRI group to include all available timeslots, or you can configure a select group of timeslots for the PRI group. For example, if only timeslots 1 to 10 are in the PRI group, enter pri-group timeslot 1-10.

If the PRI group includes all channels available for T1 (channels 1 to 24), enter pri-group timeslot 1-24.

If the PRI group includes all channels available for E1 (channels 1 to 31), enter pri-group timeslot 1-31.

3 .  

router(config-controller)# exit

Exit controller configuration mode.

Configuring BRI or PRI Interfaces for QSIG

To configure BRI or PRI interfaces for QSIG support, complete the following steps, beginning in global configuration mode:

1 . 

router(config)# interface bri slot

or

router(config)# interface bri slot/port

(BRI only on Cisco MC3810, 2600, and 3600 series routers) Enter interface configuration mode to configure parameters for the specified BRI voice interface.

(Cisco MC3810) Enter a slot number from 1 to 4.

(Cisco 2600 or 3600 series router) Enter a slot number from 1 to 6 and a port value of 1 or 2.

2 .  

router(config)# isdn static tei 0

(BRI only on Cisco MC3810, 2600, and 3600 series routers) This command is required. In previous releases, it was set automatically when the isdn switch-type basic-qsig command was issued.

3 . 

router(config-if)# isdn layer1-emulate {user |
network}

(BRI only, Cisco MC3810 only) Configure the Layer 1 port mode emulation and the clock settings:

  • Enter user to configure the port as TE and to function as a clock slave. This is the default. The term user is equivalent to the QSIG term slave.

  • Enter network to configure the port as NT and to function as a clock master. The term network is equivalent to the QSIG term master.

4 .  

router(config-if)# network-clock-priority {low | high}

(BRI only, Cisco MC3810 only) If this BRI voice port is configured as TE and you want it to be the first-priority BRI voice port for recovering clock from the network NT device, enter high.

If this BRI voice port is configured as TE and you want it to be a low-priority BRI voice port for recovering clock from the network NT device, enter low.

Do not use this command if this port is configured as NT in Step 3 with the command isdn layer1-emulate network.

5 .  

router(config-if)# isdn incoming-voice voice

Route incoming voice calls. This is set for voice-capable BRI interfaces by default, except for Cisco 2600 and 3600 BRI S/T TE voice interface cards, where, unless this command is used, the isdn incoming-voice modem configuration setting is converted to isdn incoming-voice voice when it receives an incoming call.

6 .  

router(config-if)# isdn sending-complete

(Optional) Configure the voice port to include the Sending Complete information element in the outgoing call setup message. This command is used in some geographic locations, such as Hong Kong and Taiwan, where the sending complete information element is required in the outgoing call setup message.

7 . 

router(config-if)# isdn switch-type basic-qsig

(Optional, BRI only on Cisco MC3810, 2600, and 3600 series routers, see "Switch-Type Configuration Options") If the service provider switch type for this BRI port is different from the global ISDN switch type, configure the interface ISDN switch type to match the service provider switch type. The interface ISDN switch type overrides the global ISDN switch type on this interface.

Continue BRI interface configuration at Step 4 of the following procedure.

8 .  

router(config-if)# exit

(PRI only) Exit interface configuration mode.

If you are configuring a BRI interface, begin at Step 4. If you are configuring a PRI interface, begin at Step 1.

1 . 

router(config)# interface serial slot/port:channelnumber

or

interface serial 1:channelnumber

(PRI only) Enter interface configuration mode for the ISDN PRI interface and the interface slot and port location.

On a Cisco MC3810, enter the slot location as 1.

On any supported router, for T1, enter the channel number as 23. For E1, enter 15.

2 .  

router(config-if)# isdn switch-type primary-qsig

(PRI only, see "Switch-Type Configuration Options") If you did not configure the global PRI ISDN switch type for Q.SIG support in global configuration mode, configure the interface ISDN switch type to support Q.SIG signaling.

The conditions that apply to this command in global configuration mode also apply to this command in interface configuration mode.

Note This interface command overrides the global isdn switch-type command setting for this interface.

3 .  

router(config-if)# isdn contiguous-bchan

(PRI only, E1 only) Specify contiguous bearer channel handling so that B channels 1 through 30 map to time slots 1 to 31, skipping 16.

4 .  

router(config-if)# isdn protocol-emulate {user | network}

Configure the Layer 2 and Layer 3 port protocol emulation:

  • Enter user (equivalent to the QSIG term slave) to configure the port as TE; the PINX is the master. This is the default.

  • Enter network (equivalent to the QSIG term master) to configure the port as NT; the PINX is the slave.

Note On the Cisco MC3810, this command replaces the command isdn switch-type [primary-qsig-slave | primary-qsig-master].

5 .  

router(config-if)# isdn overlap-receiving value

(Optional) Activate overlap signaling to send to the destination PBX. In this mode, the interface waits for possible additional call-control information from the preceding PINX.

Note You can leave the default mode of enbloc, where all call establishment information is sent in the setup message without need for additional messages from the preceding PINX.

6 .  

router(config-if)# isdn network-failure-cause [value]

(Optional) Specify the cause code to pass to the PBX when a call cannot be placed or completed because of internal network failures. Possible values are from 1 to 127. See Table 3 for a list.

Note All cause codes except for Normal Call Clearing (16), User Busy (17), No User Responding (18) and No Answer from User (19) will be changed to the specified cause code.

7 .  

router(config-if)# exit

Exit interface configuration mode.


Table 3: ISDN Failure Cause Codes
No. Meaning No. Meaning No. Meaning No. Meaning

1

Unallocated or unassigned number

29

Facility rejected

54

Incoming calls barred

86

Call with requested call ID is cleared

2

No route to specified transit network

30

Response to status enquiry

57

Bearer capability not authorized

88

Incompatible destination

3

No route to destination

31

Normal, unspecified

58

Bearer capability not now available

91

Invalid transit network selection

6

Channel unacceptable

34

No circuit/channel available

63

Service or option not available, unspecified

95

Invalid message, unspecified

7

Call awarded and being delivered in an established channel

38

Network out of order

65

Bearer capability not implemented

96

Mandatory information element missing

16

Normal call clearing

41

Temporary failure

66

Channel type not implemented

97

Message type nonexistent or not implemented

17

User busy

42

Switch congestion

69

Requested facility not implemented

98

Message not compatible with call state or message type nonexistent or not implemented

18

No user responding

43

Access information discarded

70

Only restricted digital information bearer capability is available

99

Information element nonexistent or not implemented

19

No answer from user (user alerted)

44

Requested channel not available

79

Service or option not implemented, unspecified

100

Invalid information element contents

21

Call rejected

45

Preempted

81

Invalid call reference value

101

Message not compatible with call state

22

Number changed

47

Resources unavailable, unspecified

82

Identified channel does not exist

102

Recovery on timer expiry

26

Non selected user clearing

49

Quality of service unavailable

83

Suspended call exists, but this call ID does not

111

Protocol error, unspecified

27

Destination out of order

50

Requested facility not subscribed

84

Call ID in use

127

Interworking, unspecified

28

Invalid number format

52

Outgoing calls barred

85

No call suspended

Verifying the QSIG Configuration

Perform the following steps to confirm the QSIG configuration. The show running-config command displays PRI time slot group configuration and other details, as shown in "Configuration Examples".

Step 1 To see information about switch type, memory, status, and Layer 2 and Layer 3 timers, enter the show isdn {memory | status | timers} command.

For more information about this command, see Cisco IOS 12.0 Dial Solutions Command Reference at:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/dial_r/index.htm

The following sample output shows the results of the show isdn status command for a BRI voice port and a PRI voice port on the Cisco MC3810:

router# show isdn status
Global ISDN Switchtype = basic-qsig
ISDN BRI1 interface
dsl 1, interface ISDN Switchtype = basic-qsig
**** Slave side configuration ****
    Layer 1 Status:
DEACTIVATED
    Layer 2 Status:
TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
    Layer 3 Status:
NLCB:callid=0x0, callref=0x0, state=31, ces=0 event=0x0
0 Active Layer 3 Call(s)
    Activated dsl 1 CCBs = 0
ISDN BRI2 interface
.
.
 
router# show isdn status
 
     Global ISDN Switchtype = primary-qsig
     ISDN Serial1:23 interface
             dsl 0, interface ISDN Switchtype = primary-qsig
              **** Slave side configuration ****
         Layer 1 Status:
             DEACTIVATED
         Layer 2 Status:
             TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
         Layer 3 Status:
             0 Active Layer 3 Call(s)
         Activated dsl 0 CCBs = 0
         The Free Channel Mask: 0x7FFFFF

The following sample output shows the results of the show isdn status command for a BRI voice port on a Cisco 3600 series router:

router# show isdn status
Global ISDN Switchtype = primary-qsig
ISDN Serial3/1:15 interface
        dsl 0, interface ISDN Switchtype = primary-qsig
         **** Master side configuration ****
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
    Layer 3 Status:
        29 Active Layer 3 Call(s)
    Activated dsl 0 CCBs = 29
        CCB:callid=89BF, sapi=0, ces=0, B-chan=5, calltype=VOICE
.
.
.
.
        CCB:callid=89C8, sapi=0, ces=0, B-chan=14, calltype=VOICE
.
.
.
.
        CCB:callid=89D9, sapi=0, ces=0, B-chan=1, calltype=VOICE
        CCB:callid=89DA, sapi=0, ces=0, B-chan=2, calltype=VOICE
        CCB:callid=89DB, sapi=0, ces=0, B-chan=3, calltype=VOICE
    The Free Channel Mask: 0x80000018
ISDN Serial3/0:15 interface
        dsl 1, interface ISDN Switchtype = primary-qsig
         **** Master side configuration ****
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
        TEI = 0, Ces = 9, SAPI = 16, State = TEI_ASSIGNED
    Layer 3 Status:
        28 Active Layer 3 Call(s)
    Activated dsl 1 CCBs = 28
        CCB:callid=BDF, sapi=0, ces=0, B-chan=2, calltype=VOICE
        CCB:callid=BE0, sapi=0, ces=0, B-chan=1, calltype=VOICE
        CCB:callid=BE1, sapi=0, ces=0, B-chan=3, calltype=VOICE
   .
.
.
.
        CCB:callid=BFA, sapi=0, ces=0, B-chan=31, calltype=VOICE
    The Free Channel Mask: 0xB0000000
    Total Allocated ISDN CCBs = 54
 
Total Allocated ISDN CCBs = 0
.
.
.
.
        CCB:callid=89C8, sapi=0, ces=0, B-chan=14, calltype=VOICE
.
.
.
.
        CCB:callid=89D9, sapi=0, ces=0, B-chan=1, calltype=VOICE
        CCB:callid=89DA, sapi=0, ces=0, B-chan=2, calltype=VOICE
        CCB:callid=89DB, sapi=0, ces=0, B-chan=3, calltype=VOICE
    The Free Channel Mask: 0x80000018
ISDN Serial3/0:15 interface
        dsl 1, interface ISDN Switchtype = primary-qsig
         **** Master side configuration ****
    Layer 1 Status:
        ACTIVE
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
        TEI = 0, Ces = 9, SAPI = 16, State = TEI_ASSIGNED
    Layer 3 Status:
        28 Active Layer 3 Call(s)
    Activated dsl 1 CCBs = 28
        CCB:callid=BDF, sapi=0, ces=0, B-chan=2, calltype=VOICE
        CCB:callid=BE0, sapi=0, ces=0, B-chan=1, calltype=VOICE
        CCB:callid=BE1, sapi=0, ces=0, B-chan=3, calltype=VOICE
   .
.
.
.
        CCB:callid=BFA, sapi=0, ces=0, B-chan=31, calltype=VOICE
    The Free Channel Mask: 0xB0000000
    Total Allocated ISDN CCBs = 54

The following sample output shows the results of the show isdn status command for a PRI voice port on a Cisco 7200 VXR series router:

Global ISDN Switchtype = primary-qsig
ISDN Serial1/0:15 interface
        dsl 0, interface ISDN Switchtype = primary-qsig
         **** Slave side configuration ****
    Layer 1 Status:
        DEACTIVATED
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
    Layer 3 Status:
        0 Active Layer 3 Call(s)
    Activated dsl 0 CCBs = 0
    The Free Channel Mask:  0x7FFF7FFF
ISDN Serial1/1:15 interface
        dsl 1, interface ISDN Switchtype = primary-qsig
         **** Slave side configuration ****
    Layer 1 Status:
        DEACTIVATED
    Layer 2 Status:
        TEI = 0, Ces = 1, SAPI = 0, State = TEI_ASSIGNED
    Layer 3 Status:
        0 Active Layer 3 Call(s)
    Activated dsl 1 CCBs = 0
    The Free Channel Mask:  0x7FFF7FFF
    Total Allocated ISDN CCBs = 0

Step 2 To display the state and the service status of each ISDN channel, enter the show isdn service privileged EXEC command.

The following example shows sample output from the show isdn service command when PRI is configured on a T1 controller:

router# show isdn service
 
PRI Channel Statistics:
ISDN Se0:15, Channel (1-31)
  Activated dsl 8
  State (0=Idle 1=Propose 2=Busy 3=Reserved 4=Restart 5=Maint)
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 
  Channel (1-31) Service (0=Inservice 1=Maint 2=Outofservice)
  0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

Step 3 To display the Call Distributor Application Programming Interface (CDAPI) information, use the show cdapi command.

The following sample output shows the results of the show cdapi command PRI on a the Cisco 3660 series router:

Registered CDAPI Applications/Stacks
====================================
 
Application: TSP CDAPI Application Voice
        Application Type(s) : Voice Facility Signaling
        Application Level   : Tunnel
        Application Mode    : Enbloc
 
Signaling Stack: ISDN
        Interface: Se5/0:15
 
Signaling Stack: ISDN
        Interface: Se5/1:15
 
Signaling Stack: ISDN
        Interface: Se6/0:15
 
Signaling Stack: ISDN
        Interface: Se6/1:15
 
CDAPI Message Buffers
=====================
 
Used Msg Buffers: 0, Free Msg Buffers: 9600
Used Raw Buffers: 0, Free Raw Buffers: 4800
Used Large-Raw Buffers: 0, Free Large-Raw Buffers: 480

The following sample output shows the results of the show cdapi command for a PRI voice port on the Cisco MC3810:

Registered CDAPI Applications/Stacks
====================================
 
Application: TSP CDAPI Application Voice
        Application Type(s) : Voice Facility Signaling
        Application Level   : Tunnel
        Application Mode    : Enbloc
 
Signaling Stack: ISDN
        Interface: Se1:15
 
CDAPI Message Buffers
=====================
 
Used Msg Buffers: 2, Free Msg Buffers: 1198
Used Raw Buffers: 2, Free Raw Buffers: 598
Used Large-Raw Buffers: 0, Free Large-Raw Buffers: 60

Troubleshooting Tips

The table below lists debug and show commands that can help you analyze problems with your configuration. "Related Documents" lists documentation that includes information about these commands.
Command Purpose 
router# show isdn status

Shows the status of all ISDN interfaces, including active layers, timer information, and switch type settings.

router# show controller t1/e1

Shows information about T1 and E1 controllers.

router# show voice port summary

Shows summary information about voice-port configuration.

router# show dial-peer voice

Shows how voice dial peers are configured.

router# show cdapi

Shows the Call Distributor Application Programming Interface (CDAPI) information.

router# show call history voice record

Shows information about calls made to and from the router.

router# show rawmsg

Shows information about any memory leaks.

router# debug isdn event

Shows events occurring on the user side (on the router) of the ISDN interface. The ISDN events that can be displayed are Q.931 events (call setup and teardown of ISDN network connections).

router# debug tsp

Shows information about the telephony service provider (TSP).

router# debug cdapi { events | detail }

Shows information about CDAPI application events, registration, messages, and so on.

Configuration Examples

The following configuration examples shows QSIG configuration on several supported routers:

Note Please disregard the fictional IP addresses.

QSIG Support on Cisco 7200 VXR Series Routers

The following example configurations show how QSIG protocol support is configured with VoFR on Router A, where calls are originated, and Router B, where calls terminate.

 



Router A: Originating Configuration
Router B: Terminating Configuration



.
.
.
hostname 7200_RouterA
!
card type e1 3
card type e1 4
!
!
dspint DSPfarm3/0
!
dspint DSPfarm4/0
!         
ip subnet-zero
no ip domain-lookup
ip host routerC 223.255.254.254
ip host routerD 10.1.1.2
!
multilink virtual-template 1
frame-relay switching
isdn switch-type primary-qsig
isdn voice-call-failure 0
!
voice class codec 1
 codec preference 1 g711ulaw
 codec preference 3 g729br8
!
controller E1 3/0
 pri-group timeslots 1-31
 description qsig connected to PCG 1
!
controller E1 3/1
 pri-group timeslots 1-31
 description cas connected to PCG 2
!
controller E1 4/0
 pri-group timeslots 1-31
 description qsig group connected PCG slot3
!
controller E1 4/1
 pri-group timeslots 1-31
 description qsig group connected PCG slot4
!
interface FastEthernet0/0
 no ip address
 no ip directed-broadcast
 shutdown
 half-duplex
!
 

.
.
.
hostname 7200_RouterB
!
card type e1 3
card type e1 4
!
!
dspint DSPfarm3/0
!
dspint DSPfarm4/0
!
ip subnet-zero
ip cef
no ip domain-lookup
ip host routerC 223.255.254.254
!
multilink virtual-template 1
isdn switch-type primary-qsig
isdn voice-call-failure 0
!
controller E1 3/0
 pri-group timeslots 1-31
 description qsig connected to PCG 5
!
controller E1 3/1
 pri-group timeslots 1-31
 description cas connected to PCG 6
!
controller E1 4/0
 pri-group timeslots 1-31
 description cas connected to PCG slot7
!
controller E1 4/1
 pri-group timeslots 1-31
 description cas connected to PCG slot8
!
interface Loopback0
 no ip address
 no ip directed-broadcast
!
interface FastEthernet0/0
 description VOIP_10.0.0.1_maxstress to 7200_RouterAgate
 ip address 10.0.0.1 255.0.0.0
 no ip directed-broadcast
 no ip mroute-cache
 shutdown
 media-type MII
 full-duplex
!



interface Serial1/0
 bandwidth 512
 ip address 10.1.1.104 255.255.255.0
 no ip directed-broadcast
 encapsulation ppp
 no ip route-cache
 no ip mroute-cache
 load-interval 30
 no keepalive
 shutdown
 no fair-queue
 clockrate 2015232
 ppp multilink
!
interface Serial1/1
 description vofr connection to 7200_RouterB_s1/1
 ip address 10.0.0.2 255.0.0.0
 ip broadcast-address 10.0.0.0
 no ip directed-broadcast
 encapsulation frame-relay
 no ip route-cache
 no ip mroute-cache
 no keepalive
 frame-relay traffic-shaping
 frame-relay map ip 10.0.0.1 100 broadcast
 frame-relay interface-dlci 100
  class vofr_class
  vofr data 4 call-control 5
!
interface Serial1/2
 no ip address
 no ip directed-broadcast
 no ip route-cache
 no ip mroute-cache
 shutdown
!
interface Serial1/3
 no ip address
 no ip directed-broadcast
 no ip route-cache
 no ip mroute-cache
 shutdown
 clockrate 2015232
!
interface Ethernet2/0
 ip address 10.1.50.77 255.255.0.0
 ip broadcast-address 10.1.0.0
 no ip directed-broadcast
 no ip route-cache
 no ip mroute-cache
!         
interface Ethernet2/1
 ip address 10.0.0.2 255.255.0.0
 ip broadcast-address 10.0.0.0
 no ip directed-broadcast
 no ip route-cache
 no ip mroute-cache
 shutdown
!
 

interface Serial1/0
 no ip address
 no ip directed-broadcast
 no ip mroute-cache
 shutdown
!         
interface Serial1/1
 description vofr connection to 7200_RouterA
 ip address 10.0.0.1 255.0.0.0
 ip broadcast-address 10.0.0.0
 no ip directed-broadcast
 encapsulation frame-relay
 no keepalive
 clockrate 8060928
 frame-relay traffic-shaping
 frame-relay map ip 10.0.0.2 100 broadcast
 frame-relay interface-dlci 100
  class vofr_class
  vofr data 4 call-control 5
!
interface Serial1/2
 no ip address
 no ip directed-broadcast
 shutdown
 clockrate 2015232
!
interface Serial1/3
 no ip address
 no ip directed-broadcast
 shutdown
!
interface Ethernet2/0
 ip address 10.5.192.123 255.255.0.0
 ip helper-address 223.255.254.254
 no ip directed-broadcast
 no ip mroute-cache
!
interface Ethernet2/1
 ip address 10.0.0.1 255.255.0.0
 no ip directed-broadcast
 no ip mroute-cache
 shutdown
!
 



interface Ethernet2/2
 no ip address
 no ip directed-broadcast
 no ip route-cache
 no ip mroute-cache
 shutdown
!
interface Ethernet2/3
 no ip address
 no ip directed-broadcast
 no ip route-cache
 no ip mroute-cache
 shutdown
interface Serial3/0:15
 no ip address
 no ip directed-broadcast
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bchan-number-order ascending
 no cdp enable
!
interface Serial3/1:15
 no ip address
 no ip directed-broadcast
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bchan-number-order ascending
 no cdp enable
!
interface Serial4/0:15
 no ip address
 no ip directed-broadcast
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bchan-number-order ascending
 no cdp enable
!
interface Serial4/1:15
 no ip address
 no ip directed-broadcast
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bchan-number-order ascending
 no cdp enable
!
interface ATM5/0
 no ip address
 no ip directed-broadcast
 no ip route-cache
 no ip mroute-cache
 shutdown
 no atm ilmi-keepalive
 

interface Ethernet2/2
 no ip address
 no ip directed-broadcast
 shutdown
!
interface Ethernet2/3
 no ip address
 no ip directed-broadcast
 shutdown 
interface Serial3/0:15
 no ip address
 no ip directed-broadcast
 no ip route-cache cef
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bchan-number-order ascending
 no cdp enable
!
interface Serial3/1:15
 no ip address
 no ip directed-broadcast
 no ip route-cache cef
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bchan-number-order ascending
 no cdp enable
!
interface Serial4/0:15
 no ip address
 no ip directed-broadcast
 no ip route-cache cef
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bchan-number-order ascending
 no cdp enable
!
interface Serial4/1:15
 no ip address
 no ip directed-broadcast
 no ip route-cache cef
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn bchan-number-order ascending
 no cdp enable
!
interface ATM5/0
 no ip address
 no ip directed-broadcast
 shutdown
 no atm ilmi-keepalive



!
interface Virtual-Template1
 ip address 10.0.0.2 255.255.255.0
 no ip directed-broadcast
 load-interval 30
 fair-queue 64 256 1
 ppp multilink
 ppp multilink fragment-delay 20
 ppp multilink interleave
 ip rtp priority 16384 16383 92
!
router igrp 144
 network 10.0.0.0
!
ip default-gateway 10.21.75.10
ip classless
no ip http server
!
!
map-class frame-relay vofr_class
 no frame-relay adaptive-shaping
 frame-relay cir 4400000
 frame-relay bc 1000
 frame-relay fair-queue
 frame-relay voice bandwidth 4000000
 frame-relay fragment 256
!

!
interface FastEthernet6/0
 no ip address
 no ip directed-broadcast
 shutdown
 half-duplex
interface Virtual-Template1
 ip unnumbered Loopback0
 no ip directed-broadcast
 no ip route-cache cef
 ip mroute-cache
 ppp multilink
 ppp multilink fragment-delay 20
 ppp multilink interleave
!
router igrp 144
 network 10.0.0.0
!
ip classless
no ip http server
!
!
map-class frame-relay vofr_class
 no frame-relay adaptive-shaping
 frame-relay cir 4400000
 frame-relay bc 1000
 frame-relay fair-queue
 frame-relay voice bandwidth 4000000
 frame-relay fragment 256
!



voice-port 3/0:15
 compand-type a-law
 cptone DE
!
voice-port 3/1:15
 compand-type a-law
 cptone DE
!
voice-port 4/0:15
 compand-type a-law
 cptone DE
!
voice-port 4/1:15
 compand-type a-law
 cptone DE
!
dial-peer voice 5552222 pots
 destination-pattern +5552...
 direct-inward-dial
 port 3/1:15
 prefix 5552
!
dial-peer voice 5551111 vofr
 destination-pattern +5......
 sequence-numbers
 session target Serial1/1 100
 codec g729br8
!
dial-peer voice 5554 pots
 destination-pattern 5554...
 direct-inward-dial
 port 4/1:15
 prefix 5554
!
dial-peer voice 5553 pots
 destination-pattern 5553...
 direct-inward-dial
 port 4/0:15
 prefix 5553
!
dial-peer voice 5551 pots
 destination-pattern +5551...
 direct-inward-dial
 port 3/0:15
 prefix 5551
.
.
.

voice-port 3/0:15
 compand-type a-law
!
voice-port 3/1:15
 compand-type a-law
!
voice-port 4/0:15
 compand-type a-law
!
voice-port 4/1:15
 compand-type a-law
!
dial-peer voice 5552222 pots
 destination-pattern +5552...
 direct-inward-dial
 port 3/1:15
 prefix 6662
!
dial-peer voice 5551111 vofr
 destination-pattern +5......
 sequence-numbers
 session target Serial1/1 100
 codec g729br8
!
dial-peer voice 6661 pots
 destination-pattern +6661...
 direct-inward-dial
 port 3/0:15
 prefix 6661
!         
dial-peer voice 6663 pots
 destination-pattern +6663...
 direct-inward-dial
 port 4/0:15
 prefix 6663
!
dial-peer voice 6664 pots
 destination-pattern +6664...
 direct-inward-dial
 port 4/1:15
 prefix 6664
.
.
.

QSIG Support on Cisco 3600 Series Routers

The example below shows how a Cisco 3660 series router can be configured for E1 and PRI with QSIG signaling support using VoIP and VoATM.

.
.
.
hostname router3660
!
!
!
!
!
!
memory-size iomem 20
voice-card 5
!
voice-card 6
!
ip subnet-zero
!
isdn switch-type primary-qsig
isdn voice-call-failure 0
!
!
!
!
controller E1 5/0
 pri-group timeslots 1-5,16
!
controller E1 5/1
 pri-group timeslots 1-31
!
controller E1 6/0
 pri-group timeslots 1-31
!
controller E1 6/1
 pri-group timeslots 1-31
!
!
!
interface FastEthernet0/0
 ip address 10.7.72.9 255.255.255.0
 speed auto
 half-duplex
!
interface FastEthernet0/1
 ip address 10.100.100.7 255.255.255.0
 no keepalive
 duplex auto
 speed auto
 hold-queue 1000 in
!
interface Serial2/0
 no ip address
 shutdown
!
interface Serial2/1
 no ip address
 shutdown
!
interface Serial2/2
 no ip address
 shutdown
!
interface Serial2/3
 no ip address
 shutdown
!
interface ATM3/0
 no ip address
 atm clock INTERNAL
 no atm ilmi-keepalive
 pvc 10/40
  vbr-rt 155000 50000 64000
  encapsulation aal5mux voice
 !
interface Serial5/0:15
 no ip address
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 no cdp enable
!
interface Serial5/1:15
 no ip address
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn incoming-voice voice
 fair-queue 64 256 0
 no cdp enable
!
interface Serial6/0:15
 no ip address
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn incoming-voice voice
 fair-queue 64 256 0
 no cdp enable
!
interface Serial6/1:15
 no ip address
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn incoming-voice voice
 fair-queue 64 256 0
 no cdp enable
!
ip classless
ip route 223.255.254.254 255.255.255.255 FastEthernet0/0
no ip http server
!
!
map-class frame-relay frs0
 frame-relay voice bandwidth 1260000
 frame-relay fragment 200
 no frame-relay adaptive-shaping
 frame-relay cir 1260000
 frame-relay fair-queue
!
voice-port 1/0/0
 modem passthrough system
 timing hookflash-in 0
!
voice-port 1/0/1
 modem passthrough system
 timing hookflash-in 0
!
voice-port 5/0:15
 compand-type a-law
!
voice-port 5/1:15
 compand-type a-law
 cptone DE
!
voice-port 6/0:15
 compand-type a-law
 cptone DE
!
voice-port 6/1:15
 no echo-cancel enable
 compand-type a-law
 cptone DE
!
dial-peer voice 1 pots
 shutdown
 destination-pattern 21...
 modem passthrough system
 direct-inward-dial
!
dial-peer voice 51 voip
 shutdown
 destination-pattern 6504007
 modem passthrough system
 session target ipv4:100.100.100.3
!
dial-peer voice 2 pots
 shutdown
 destination-pattern 21...
 modem passthrough system
 direct-inward-dial
 port 5/1:15
!
dial-peer voice 3 voip
 shutdown
 destination-pattern 22...
 modem passthrough system
 session target ipv4:100.100.100.6
!
dial-peer voice 5 pots
 shutdown
 destination-pattern 22...
 modem passthrough system
 direct-inward-dial
 prefix 4006
!
dial-peer voice 13 pots
 shutdown
 destination-pattern 21...
 modem passthrough system
 direct-inward-dial
 port 6/0:15
!
dial-peer voice 6 pots
 destination-pattern 21...
 modem passthrough system
 direct-inward-dial
 port 6/1:15
!
dial-peer voice 44 voatm
 destination-pattern 22...
 modem passthrough system
 session target ATM3/0 pvc 10/40
!
dial-peer voice 20 pots
 incoming called-number 4...
 destination-pattern 4007
 modem passthrough system
 direct-inward-dial
 port 5/0:15
 prefix 4007
!
dial-peer voice 21 pots
 destination-pattern 4006
 modem passthrough system
 direct-inward-dial
 port 5/0:15
 prefix 4006
!
!
line con 0
 transport input none
line aux 0
line vty 0 4
 login
!
end

QSIG Support on the Cisco MC3810

The example below shows how a Cisco MC3810 can be configured for E1 and PRI with QSIG signaling support and VoIP and VoFR.

.
.
.
hostname Router3810
!
!
!
!
!
!
network-clock base-rate 56k
ip subnet-zero
!
isdn switch-type primary-qsig
isdn voice-call-failure 0
!
!
!
!
controller T1 0
 mode atm
 framing esf
 clock source internal
 linecode b8zs
!
controller E1 1
 pri-group timeslots 1-7,16
!
!
!
interface Ethernet0
 ip address 100.100.100.6 255.255.255.0
 no ip directed-broadcast
!
interface Serial0
 bandwidth 2000
 ip address 10.168.14.1 255.255.255.0
 no ip directed-broadcast
 encapsulation frame-relay
 no ip mroute-cache
 no keepalive
 clockrate 2000000
 cdp enable
 frame-relay traffic-shaping
 frame-relay interface-dlci 100
  class frs0
  vofr cisco
!
interface Serial1
 no ip address
 no ip directed-broadcast
 shutdown
!
interface Serial1:15
 no ip address
 no ip directed-broadcast
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 fair-queue 64 256 0
 no cdp enable
!
interface ATM0
 no ip address
 no ip directed-broadcast
 ip mroute-cache
 no atm ilmi-keepalive
 pvc 10/42
  encapsulation aal5mux voice
 !
!
interface FR-ATM20
 no ip address
 no ip directed-broadcast
 shutdown
!
no ip http server
ip classless
ip route 223.255.254.0 255.255.255.0 Ethernet0
!
!
map-class frame-relay frs0
 frame-relay voice bandwidth 1260000
 frame-relay fragment 200
 no frame-relay adaptive-shaping
 frame-relay cir 1260000
 frame-relay fair-queue
!
map-class frame-relay frsisco
!
voice-port 1:15
 compand-type a-law
!
dial-peer voice 100 voatm
 shutdown
 destination-pattern 4...
 session target ATM0 pvc 10/42
 codec g729ar8
 no vad
!
dial-peer voice 1 pots
 shutdown
 destination-pattern 3001
!
dial-peer voice 42 vofr
 destination-pattern 4006
 session target Serial0 100
 signal-type ext-signal
!
dial-peer voice 21 pots
 destination-pattern 4007
 direct-inward-dial
 port 1:15
 prefix 4007
!
dial-peer voice 12 voip
 shutdown
 destination-pattern 4006
 session target ipv4:100.100.100.7
.
.
.

Command Reference

This section describes new and modified commands for use with QSIG protocol support. All other commands used with this feature are documented in the Cisco IOS Release 12.0 command reference publications and online feature documentation. See "Related Documents".

isdn contiguous-bchan

To configure contiguous bearer channel handling on an E1 Primary Rate Interface (PRI) interface, use the isdn contiguous-bchan interface configuration command. To disable the contiguous B channel handling, use the no form of this command.

isdn contiguous-bchan

no isdn contiguous-bchan

Syntax Description

This command has no arguments or keywords.

Defaults

By default, contiguous B channel handling is off.

Command Mode

Interface configuration

Command History

Release Modification

12.0(7)XK

This command was introduced.

Usage Guidelines

Use the isdn contiguous-bchan command to specify contiguous bearer channel handling so that B channels 1 through 30, skipping 16, map to timeslots 1 through 31). This is available for E1 PRI interfaces only, when the primary-qsig switch type option is configured by using the isdn switch-type command.

Example

The following example shows the command configuration on a Cisco 3660 series router E1 interface:

interface Serial5/0:15
 no ip address
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice
 isdn continguous-bchan

Related Commands

Command Description

isdn switch-type primary-qsig

In global or interface configuration mode, configures the primary-qsig switch type for PRI support.

isdn incoming-voice

To route all incoming voice calls as voice calls, to route them the modem and treat them as analog data, or to ensure that calls bypass the modems and are treated as digital data, use the isdn incoming-voice interface configuration command. Use the no form of this command to disable the setting.

isdn incoming-voice {data [56 | 64] | modem [56 | 64] | voice}

no isdn incoming-voice {data [56 | 64] | modem [56 | 64] | voice}

Syntax Description

data

Specifies that incoming voice calls bypass the modems and are handled as digital data.

modem

Specifies that incoming voice calls are passed over to the digital modems, where they negotiate the appropriate modem connection with the far-end modem.

voice

Specifies that incoming voice calls are treated as voice calls rather than being routed to the modem or handled as digital data.

56

Specifies that the bandwidth for this connection is 56 kbps.

64

Specifies that the bandwidth for this connection is 64 kbps. If no argument is entered for either the data or modem keywords, the default value is 64.

Default

When a PRI or BRI interface is created, isdn incoming-voice voice is the default, except on a Cisco 2600 or 3600 BRI S/T TE interface. In this case, if the command is not specified, the default isdn incoming-voice modem configuration setting is converted to isdn incoming-voice voice when the interface receives an incoming call.

Command Mode

Interface configuration

Command History

Release Modification

11.1

This command was introduced.

12.0(2)XC and 12.0(3)T

This command was made available for BRI interfaces.

12.0(7)XK

This command was modified to include the voice keyword.

Usage Guidelines

Unless you specify otherwise, all calls received by the router and characterized as voice calls are treated as such and not handled as digital data or not passed over to the modem.

On a Cisco 2600 or 3600 series router BRI S/T TE interface where the isdn incoming-voice command is not specified, the default isdn incoming-voice modem configuration setting is converted to isdn incoming-voice voice when the interface receives an incoming call.

To establish speedier connections for analog calls to the router, use the isdn incoming-voice command with the modem keyword to have voice calls routed through digital modems (as pulse-code modulated analog data) instead of being treated as digital data.

Example

The following example shows the command configuration on a Cisco 3660 series router T1 PRI interface:

interface Serial5/0:23
 no ip address
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn incoming-voice voice

isdn protocol-emulate

To configure a Primary Rate Interface (PRI) interface to serve as either the primary QSIG slave or the primary QSIG master, use the isdn protocol-emulate interface command. To disable QSIG signaling, use the no form of this command.

isdn protocol-emulate { user | network }

no isdn protocol-emulate { user | network }

Syntax Description

user

Enter user (equivalent to the QSIG term slave) to configure the port as the terminating end. This is the default.

network

Enter network (equivalent to the QSIG term master) to configure the port as NT; the PINX is the slave.

Default

User

Command Mode

Interface configuration mode.

Command History

Release Modification

12.0(7)T

This command was introduced for the Cisco AS5300.

12.0(7)XK

This command was introduced for the Cisco MC3810, and for the Cisco 7200 VXR, Cisco 2600, and Cisco 3600 series routers.

Usage Guidelines

On the Cisco MC3810, this command replaces the command isdn switch-type [primary-qsig-slave | primary-qsig-master] command.

Examples

The following example shows the command configuration on a Cisco 3660 series router T1 PRI interface:

interface Serial5/0:23
 no ip address
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn protocol-emulate user

isdn switch type

To specify a central office switch type or configure a Primary Rate Interface (PRI) interface to support Q.SIG signaling, use the isdn switch-type global or interface command. To disable the central office switch type or QSIG signaling, use the no form of this command.

isdn switch-type {switch-type | primary-qsig | basic-qsig}

no isdn switch-type {switch-type | primary-qsig | basic-qsig}

Syntax Description

switch-type

Service provider switch type. See Table 4 for a list.

primary-qsig

PRI

basic-qsig

BRI

Defaults

The switch type defaults to none, which disables the switch type.

Command Modes

Global configuration mode or interface configuration mode.

Command History

Release Modification

9.21

Introduced as a global command.

11.3 T

Introduced as an interface command.

12.0(2)T

primary-qsig-slave and primary-qsig-master keywords introduced for the Cisco MC3810.

12.0(7)K

primary-qsig-slave and primary-qsig-master keywords for the Cisco MC3810 are no longer supported. primary-qsig and basic-qsig keywords supported on the Cisco MC3810, Cisco 7200 VXR, 2600 and 3600 series routers.

Usage Guidelines

You can enter the isdn switch-type command to support QSIG at either the global configuration level or at the interface configuration level. For example, if you have a QSIG connection on one line as well as on the BRI or PRI port, you can configure the ISDN switch type in one of the following combinations:


Table 4: ISDN CO Switch Types
Country ISDN Switch Type Description

Australia

basic-ts013

Australian TS013 switches

Europe

basic-1tr6

German 1TR6 ISDN switches

basic-nwnet3

Norwegian NET3 ISDN switches (phase 1)

basic-net3

NET3 ISDN switches (UK and others)

vn2

French VN2 ISDN switches

vn3

French VN3 ISDN switches

Japan

ntt

Japanese NTT ISDN switches

New Zealand

basic-nznet3

New Zealand NET3 switches

North America

basic-5ess

Lucent Technologies basic rate switches

basic-dms100

NT DMS-100 basic rate switches

basic-ni1

National ISDN-1 switches

Examples

The following example shows the command configuration on a Cisco 3660 series router T1 PRI interface:

interface Serial5/0:23
 no ip address
 ip mroute-cache
 no logging event link-status
 isdn switch-type primary-qsig
 isdn overlap-receiving
 isdn protocol-emulate user

Related Commands

Command Description

isdn protocol-emulate

Configures the interface to serve as either the QSIG slave or the QSIG master.

Glossary

Note For a list of other internetworking terms, see Internetworking Terms and Acronyms document that accompanied your access server and is available on the Documentation CD-ROM and Cisco Connection Online (CCO) at the following URL: http://www.cisco.com/univercd/cc/td/doc/cisintwk/ita/index.htm.

AAL---ATM Adaptation Layer. Service-dependent sublayer of the data link layer. The AAL accepts data from different applications and presents it to the ATM layer in the form of 48-byte ATM payload segments. AALs consist of two sublayers: convergence sublayer (CS) and segmentation and reassembly (SAR). AALs differ on the basis of the source-destination timing used, whether they use constant bit rate (CBR) or variable bit rate (VBR), and whether they are used for connection-oriented or connectionless mode data transfer. At present, the four types of AAL recommended by the ITU-T are AAL1, AAL2, AAL3/4, and AAL5.

ATM---Asynchronous Transfer Mode. International standard for cell relay in which multiple service types (such as voice, video, or data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays. ATM is designed to take advantage of high-speed transmission media, such as E3, SONET, and T3.

CAS---channel-associated signaling. Trunk signaling (for example, in a T1 line) in which control signals, such as those for synchronizing and bounding frames, are carried in the same channel along with voice and data signals.

CCAPI---Call Control application programming interface (API).

CDAPI---Call Distribution application programming interface (API).

CCS---common channel signaling. Trunk signaling (for example, using Primary Rate Interface) in which a control channel carries signaling for separate voice and data channels.

CO---central office. Local telephone company office to which all local loops in a given area connect and in which circuit switching of subscriber lines occurs.

codec---coder-decoder. Device that typically uses pulse code modulation to transform analog signals into a digital bit stream and digital signals back into analog.

DTMF---dual-tone multifrequency. Use of two simultaneous voice-band tones for dialing, such as touch tone.

DSP---digital signal processor.

DVM---Digital Voice Module

E1---European digital carrier facility used for transmitting data through the telephone hierarchy. The transmission rate for E1 is 2.048 megabits per second (Mbps).

E&M---rEceive and transMit, or Ear and Mouth. Type of signaling originally developed for analog two-state voltage telephony using the ear and mouth leads; in digital telephony, uses two bits.

Enbloc---Mode where all call establishment information is sent in the setup message (opposite of overlap mode, where additional messages are needed to establish the call).

GFP---General Functional Procedures. Standard defined by ECMA-165.

H.323---Extension of ITU-T standard H.320 that enables videoconferencing over LANs and other packet-switched networks, as well as video over the Internet.

ISDN---Integrated Services Digital Network. Communication protocol offered by telephone companies that permits telephone networks to carry data, voice, and other source traffic.

Overlap---Mode where call control is waiting for possible additional call information from the preceding PINX, since it received acknowledgment that the subsequent PINX may receive additional call information.

FXO---Foreign Exchange Office. A voice interface emulating a PBX trunk line to a switch or telephone equipment to a PBX extension interface.

FXS---Foreign Exchange Station. A voice interface for connecting telephone equipment, emulates the extension interface of a PBX or the subscriber interface for a switch.

IETF---Internet Engineering Task Force.

ISDN---Integrated Services Digital Network. Communication protocol, offered by telephone companies, that permits telephone networks to carry data, voice, and other source traffic.

packet---Logical grouping of information that includes a header containing control information and (usually) user data. Packets are most often used to refer to network layer units of data.

POTS---plain old telephone service.

PDVM---packet data voice module.

PINX---private integrated services network exchange.

PSTN---Public Switched Telephone Network. General term referring to the variety of telephone networks and services in place worldwide.

QoS---quality of service. Measure of performance for a transmission system that reflects its transmission quality and service availability.

QSIG---Q (point of the ISDN model) Signaling. Signaling standard. Common channel signaling protocol based on ISDN Q.931 standards and used by many digital PBXs.

T1---Digital WAN carrier facility. T1 transmits DS 1-formatted data at 1.544 Mbps through the telephone switching network, by using alternate mark inversion or B8ZS coding.

T1 trunk---Digital WAN carrier facility. See T1.

TCCS---Transparent Common Channel Signaling

TDM---time-division multiplexing

Trunk---Physical and logical connection between two switches across which network traffic travels. A backbone is composed of a number of trunks.

UNI---User-Network Interface. ATM Forum specification that defines an interoperability standard for the interface between ATM-based products (a router or an ATM switch) located in a private network and the ATM switches located within the public carrier networks. Also used to describe similar connections in Frame Relay networks.

VAD---voice activity detection

VoFR---voice over frame relay.

VoATM---voice over ATM


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Posted: Mon Jan 24 09:19:17 PST 2000
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