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This document describes enhancements to ISDN Q.931 PRI functionality for Cisco 2600 series and Cisco 3600 series routers and includes the following sections:
Cisco platforms support Q.931 user- and network-side switch types for ISDN call processing. User-side PRI enables the Cisco platform to provide a standard ISDN PRI user-side interface to the Public Switched Telephone Network (PSTN). Network-side PRI enables the Cisco platform to provide a standard Digital T1/E1 Packet Voice Trunk Network Modules on Cisco 2600 series
and Cisco 3600 series routers
For complete VoIP configuration instructions, see Cisco IOS Release 12.1 Multiservice Applications Configuration Guide. For a description of the commands used to configure VoIP, see the "Voice-Related Commands" chapter in the Multiservice Applications Command Reference.
The Q.931 ISDN enhancements provide support for the Q.931 user- and network-side switch types for several Cisco platforms, including the Cisco 2600 series, Cisco 3600 series, and Cisco 7200 series routers. Previously, this functionality was available only on Cisco AS5300 switches.
This feature is supported on the following platforms:
None.
The following configuration tasks are described:
To configure QSIG signaling support on the Cisco 2600 or 3600 series router, complete the following steps beginning in global configuration mode:
| Command | Purpose | |||
|---|---|---|---|---|
Router(config)# isdn switch-type primary-net5 | (Optional; see note.) Selects a service provider switch type that accommodates PRI.
If you configure it here in Step 1, specify the switch type for all PRI ports. If you configure it in Step 4, specify the switch type for a single interface. The switch type specified in Step 4 for any individual interface overrides the globally specified switch type. | |||
Router(config)# controller | Enters controller configuration mode for the controller at the specified slot/port location. Valid values for slot and port are 0 and 1. | |||
Step 3 | Router(config-if)# pri-group [timeslots range] | Configures the PRI group for either T1 or E1 to carry voice traffic. For T1, available time slots are from 1 through 23; for E1, available time slots are from 1 through 31. You can configure the PRI group to include all available time slots, or you can configure a select group of time slots for the PRI group. | ||
Step 4 | Router(config-if)# | Configure the ISDN interface to serve as either the primary slave or the primary master. For this command, user specifies slave and network specifies master. | ||
Step 5 | Router(config-if)# | Turns on or turns off the power supplied from an NT-configured port to a TE device. The default is no line-power. | ||
Router(config-if)# | Routes incoming ISDN voice calls to the voice module. | |||
Step 7 | Exit from the interface configuration mode and repeat Step 2 through Step 6 for each remaining PRI voice port. | |||
Routers and PBXs are both traditionally CPE with respect to the PSTN interfaces. For Voice-over-IP (VoIP) applications, it is desirable to interface access servers to PBXs with the access server representing the PSTN.
This feature enables the access server to provide a standard ISDN PRI network-side and user-side interface to the PBXs and to mimic the behavior of legacy phone switches. To a PBX, the access server functions as a Net5 PRI switch. No change in PBX capability or behavior is required.
To configure ISDN PRI network-side and user-side support on Cisco routers, complete the following steps beginning in global configuration mode:
| Command | Purpose | |
|---|---|---|
Router(config)# controller T1 | Enter controller configuration mode for the T1 controller at the specified slot/port location. Valid values for slot and port are 0 and 1. | |
Step 2 | Router(config-controller)# pri-group timeslot range | Specify ISDN Primary Rate Interface (PRI) on a channelized T1 or E1 controller. Enter a single range of values from 1 through 23 for channelized T1 and from 1 through 31 for channelized E1. |
Step 3 | Router(config-controller)# | Specify the D-channel interface. For n, the D-channel number, use:
|
Router(config-controller)# | Configure the Layer 2 and Layer 3 port protocol emulation:
| |
Step 5 | Exit from the interface configuration mode and repeat Step 1 throughStep 4 for each remaining PRI port. | |
The example below shows how a Cisco 3660 router can be configured for E1 and PRI with network-side support using VoIP.
. hostname router3660 ! ! memory-size iomem 20 voice-card 5 ! voice-card 6 ! ip subnet-zero ! isdn switch-type primary-net5 isdn voice-call-failure 0 ! controller E1 3/0 pri-group timeslots 1-5,16 ! controller E1 3/1 pri-group timeslots 1-31 ! controller E1 4/0 pri-group timeslots 1-31 ! controller E1 4/1 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 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 protocol-emulate network 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 isdn protocol-emulate network 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 ! ! voice-port 1/0/0 timing hookflash-in 0 ! voice-port 1/0/1 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... direct-inward-dial ! dial-peer voice 51 voip shutdown destination-pattern 6504007 session target ipv4:100.100.100.3 ! dial-peer voice 2 pots shutdown destination-pattern 21... direct-inward-dial port 5/1:15 ! dial-peer voice 3 voip shutdown destination-pattern 22... 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... direct-inward-dial port 6/0:15 ! dial-peer voice 6 pots destination-pattern 21... direct-inward-dial port 6/1:15 ! dial-peer voice 20 pots incoming called-number 4... destination-pattern 4007 direct-inward-dial port 5/0:15 prefix 4007 ! dial-peer voice 21 pots destination-pattern 4006 direct-inward-dial port 5/0:15 prefix 4006 ! ! line con 0 transport input none line aux 0 line vty 0 4 login ! end
All commands used with this feature are documented in the Cisco IOS Release 12.1 command references. The following command is revised for configuration of Q.931 PRI signaling:
To configure the router PRI interface to serve as either the primary slave or the primary master, enter the isdn protocol-emulate command. Enter the no form of this command to disable the setting.
isdn protocol-emulate [user | network]
Syntax Description
user Use the user option to designate the slave. network Use the network option to designate the master.
Defaults
The switch types default to user.
Command Modes
Interface configuration mode
Command History
Cisco IOS Release 12.0(3)XG This command was introduced. Cisco IOS Release12.1(2)XH and 12.1(3)T This command was modified to support the
Release
Modification
Cisco 2600, 3600, and 7200 series routers
 |
Note You can enter this command either in the global configuration mode or in the interface configuration mode. Settings entered in the global configuration mode apply to the entire router. Settings entered in the interface configuration mode apply only to the T1/E1 interface specified. The interface configuration mode setting overrides the global configuration setting. |
Usage Guidelines
Specify a slave and a master according to the Q.931 configuration for your router.
Examples
See the following example to configues the router to act as the Q.931 master:
isdn protocol-emulate network
See the following example to configure T1 interface 23 on the router to act as the Q.931 master:
interface serial 0/1:23 isdn protocol-emulate network
Posted: Tue Jun 20 19:12:16 PDT 2000
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