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Voice Over IP for the Cisco 3600 Series Configuration Examples

Voice Over IP for the Cisco 3600 Series Configuration Examples

The actual Voice over IP configuration procedure you complete depends on the actual topology of your voice network. The following configuration examples should give you a starting point. Of course, these configuration examples would need to be customized to reflect your network topology.

Configuration procedures are supplied for the following scenarios:

These examples are described in the following sections.

FXS-to-FXS Connection Using RSVP

The following example shows how to configure Voice over IP for simple FXS-to-FXS connections.

In this example, a very small company, consisting of two offices, has decided to integrate Voice over IP into its existing IP network. One basic telephony device is connected to Router RLB-1; therefore Router RLB-1 has been configured for one POTS peer and one VoIP peer. Router RLB-w and Router R12-e establish the WAN connection between the two offices. Because one POTS telephony device is connected to Router RLB-2, it has also been configured for only one POTS peer and one VoIP peer.

In this example, only the calling end (Router RLB-1) is request RSVP. Figure 3 illustrates the topology of this FXS-to-FXS connection example.


Figure 3: FXS-to-FXS Connection Example


Configuration for Router RLB-1

hostname rlb-1
! Create voip dial-peer 10
dial-peer voice 10 voip
! Define its associated telephone number and IP address
  destination-pattern +4155264000
  sess-target ipv4:40.0.0.1
! Request RSVP 
  req-qos guaranteedDelay
! Create pots dial-peer 1
dial-peer voice 1 pots
! Define its associated telephone number and voice port
  destination-pattern +4085264000
  port 1/0/0
! Configure serial interface 0/0
interface Serial0/0
  ip address 10.0.0.1 255.0.0.0
  no ip mroute-cache
! Configure RTP header compression
  ip rtp header-compression
  ip rtp compression-connections 25
! Enable RSVP on this interface
  ip rsvp bandwidth 48 48
  fair-queue 64 256 36
  clockrate 64000
router igrp 888
  network 10.0.0.0
  network 20.0.0.0
  network 40.0.0.0

Configuration for Router RLB-w

hostname rlb-w
! Configure serial interface 1/0
interface Serial1/0
  ip address 10.0.0.2 255.0.0.0
! Configure RTP header compression
  ip rtp header-compression
  ip rtp compression-connections 25
! Enable RSVP on this interface
  ip rsvp bandwidth 96 96
  fair-queue 64 256 3
! Configure serial interface 1/3
interface Serial1/3
  ip address 20.0.0.1 255.0.0.0
! Configure RTP header compression
  ip rtp header-compression
  ip rtp compression-connections 25
! Enable RSVP on this interface
  ip rsvp bandwidth 96 96
  fair-queue 64 256 3
! Configure IGRP
router igrp 888
  network 10.0.0.0
  network 20.0.0.0
  network 40.0.0.0

Configuration for Router R12-e

hostname r12-e
! Configure serial interface 1/0
interface Serial1/0
  ip address 40.0.0.2 25.0.0.0
! Configure RTP header compression
  ip rtp header-compression
  ip rtp compression-connections 25
! Enable RSVP on this interface
  ip rsvp bandwidth 96 96
  fair-queue 64 256 3
! Configure serial interface 1/3
interface Serial1/3
  ip address 20.0.0.2 255.0.0.0
! Configure RTP header compression
  ip rtp header-compression
  ip rtp compression-connections 25
! Enable RSVP on this interface
  ip rsvp bandwidth 96 96
  fair-queue 64 256 3
  clockrate 128000
! Configure IGRP
router igrp 888
  network 10.0.0.0
  network 20.0.0.0
  network 40.0.0.0

Configuration for Router RLB-2

hostname r1b-2
! Create pots dial-peer 2
dial-peer voice 2 pots
! Define its associated telephone number and voice-port
  destination-pattern +4155264000
  port 1/0/0
! Create voip dial-peer 20
dial-peer voice 20 voip
!Define its associated telephone number and IP address
  destination-pattern +4085264000
  sess-target ipv4:10.0.0.1
! Configure serial interface 0/0
interface Serial0/0
  ip address 40.0.0.1 255.0.0.0
  no ip mroute-cache
! Configure RTP header compression
  ip rtp header-compression
  ip rtp compression-connections 25
! Enable RSVP on this interface
  ip rsvp bandwidth 96 96
  fair-queue 64 256 3
  clockrate 64000
! Configure IGRP
router igrp 888
  network 10.0.0.0
  network 20.0.0.0
  network 40.0.0.0

Linking PBX Users with E&M Trunk Lines

The following example shows how to configure Voice over IP to link PBX users with E&M trunk lines.

In this example, a company wants to connect two offices: one in San Jose, California and the other in Salt Lake City, Utah. Each office has an internal telephone network using PBX, connected to the voice network by an E&M interface. Both the Salt Lake City and the San Jose offices are using E&M Port Type II, with four-wire operation and ImmediateStart signaling. Each E&M interface connects to the router using two voice interface connections. Users in San Jose dial "8-569" and then the extension number to reach a destination in Salt Lake City. Users in Salt Lake City dial "4-527" and then the extension number to reach a destination in San Jose.

Figure 4 illustrates the topology of this connection example.


Figure 4: Linking PBX Users with E&M Trunk Lines Example


Note This example assumes that the company already has established a working IP connection between its two remote offices.

Router SJ Configuration

hostname sanjose
!Configure pots dial-peer 1
dial-peer voice 1 pots
  destination-pattern +527....
  port 1/0/0
!Configure pots dial-peer 2
dial-peer voice 2 pots
  destination-pattern +527....
  port 1/0/1
!Configure voip dial-peer 3
dial-peer voice 3 voip
  destination-pattern +569....
  session target ipv4:172.16.65.182
!Configure the E&M interface
voice-port 1/0/0
  signal immediate
  operation 4-wire
  type 2
voice-port 1/0/1
  signal immediate
  operation 4-wire
  type 2
!Configure the serial interface
interface serial 0/0
  description serial interface type dce (provides clock)
  clock rate 2000000
  ip address 172.16.1.123
  no shutdown

Router SLC Configuration

hostname saltlake
!Configure pots dial-peer 1
dial-peer voice 1 pots
  destination-pattern +569....
  port 1/0/0
!Configure pots dial-peer 2
dial-peer voice 2 pots
  destination-pattern +569....
  port 1/0/1
!Configure voip dial-peer 3
dial-peer voice 3 voip
  destination-pattern +527....
  session target ipv4:172.16.1.123
!Configure the E&M interface
voice-port 1/0/0
  signal immediate
  operation 4-wire
  type 2
voice-port 1/0/0
  signal immediate
  operation 4-wire
  type 2
!Configure the serial interface
interface serial 0/0
  description serial interface type dte
  ip address 172.16.65.182
  no shutdown
Note PBXs should be configured to pass all DTMF signals to the router. We recommend that you do not configure store and forward tone.
Note If you change the gain or the telephony port, make sure that the telephony port still accepts DTMF signals.

PSTN Gateway Access Using FXO Connection

The following example shows how to configure Voice over IP to link users with the PSTN gateway using an FXO connection.

In this example, users connected to Router SJ in San Jose, California can reach PSTN users in Salt Lake City, Utah via Router SLC. Router SLC in Salt Lake City is connected directly to the PSTN through an FXO interface.

Figure 5 illustrates the topology of this connection example.


Figure 5: PSTN Gateway Access Using FXO Connection Example


Note This example assumes that the company already has established a working IP connection between its two remote offices.

Router SJ Configuration

! Configure pots dial-peer 1
dial-peer voice 1 pots
  destination-pattern +14085274000
  port 1/0/0
! Configure voip dial-peer 2
dial-peer voice 2 voip
  destination-pattern +9...........
  session target ipv4:172.16.65.182
! Configure the serial interface
interface serial 0/0
  clock rate 2000000
  ip address 172.16.1.123
  no shutdown

Router SLC Configuration

! Configure pots dial-peer 1
dial-peer voice 1 pots
  destination-pattern +9...........
  port 1/0/0
! Configure voip dial-peer 2
dial-peer voice 2 voip
  destination-pattern +14085274000
  session target ipv4:172.16.1.123
! Configure serial interface
interface serial 0/0
  ip address 172.16.65.182
  no shutdown

PSTN Gateway Access Using FXO Connection (PLAR Mode)

The following example shows how to configure Voice over IP to link users with the PSTN Gateway using an FXO connection (PLAR mode).

In this example, PSTN users in Salt Lake City, Utah, can dial a local number and establish a private line connection in a remote location. As in the previous example, Router SLC in Salt Lake City is connected directly to the PSTN through an FXO interface.

Figure 6 illustrates the topology of this connection example.


Figure 6: PSTN Gateway Access Using FXO Connection (PLAR Mode)


Note This example assumes that the company already has established a working IP connection between its two remote offices.

Router SJ Configuration

! Configure pots dial-peer 1
dial-peer voice 1 pots
  destination-pattern +14085274000
  port 1/0/0
! Configure voip dial-peer 2
dial-peer voice 2 voip
  destination-pattern +9...........
  session target ipv4:172.16.65.182
! Configure the serial interface
interface serial 0/0
  clock rate 2000000
  ip address 172.16.1.123
  no shutdown

Router SLC Configuration

! Configure pots dial-peer 1
dial-peer voice 1 pots
  destination-pattern +9...........
  port 1/0/0
! Configure voip dial-peer 2
dial-peer voice 2 voip
  destination-pattern +14085274000
  session target ipv4:172.16.1.123
! Configure the voice port
voice port 1/0/0
connection plar 14085274000
! Configure the serial interface
interface serial 0/0
  ip address 172.16.65.182
  no shutdown


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