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Session Initiation Protocol

Case Study: Configuring SIP Between a Gateway and CallManager 5.x

In this case study, SIP is being introduced into the New York and Shanghai networks. The locations will use both SIP and SCCP phones, and a SIP trunk will be configured between the New York CallManager cluster and the Shanghai gateway, shown in Figure 4-12. CallManager 5.x is used to register the SIP phones. The preferred DTMF relay method will be SIP-NOTIFY, but RTP-NTE will be accepted as a second choice.

Figure 4-12

Figure 4-12 SIP Case Study Network Diagram

For redundancy, the Shanghai gateway has dial peers to two of the CallManager servers. One CallManager IP address is configured under the UA, to demonstrate that command. The gateway will register its network analog phones with registrar servers at 10.10.10.19 and 10.10.10.20. HTTP digest authentication is configured.

All SIP traffic will use interface Fa0/0 as its source IP address. Large packets will switch from UDP to TCP as their transport protocol to avoid UDP fragmentation.

Example 4-14 shows the configuration of SIP and the SIP trunk on the Shanghai gateway. POTS dial peers to connect to the PBX are not shown in this example. CallManager configuration is outside the scope of this case study.

Example 4-14. SIP Case Study

Shanghai-GW(config)#sip-ua
Shanghai-GW(config-sip-ua)#sip-server ipv4:10.10.10.11
Shanghai-GW(config-sip-ua)#registrar ipv4:10.10.10.19
Shanghai-GW(config-sip-ua)#registrar ipv4:10.10.10.20 secondary
Shanghai-GW(config-sip-ua)#authentication username NYCServ1 password
C1sc0 realm
 NYC-SIP
!
Shanghai-GW(config)#voice service voip
Shanghai-GW(conf-voi-serv)#sip
Shanghai-GW(conf-serv-sip)#bind all source-interface fa0/0
Shanghai-GW(conf-serv-sip)#transport switch udp tcp
!
Shanghai-GW(config)#dial-peer voice 2121 voip
Shanghai-GW(config-dial-peer)#destination-pattern 21255521..
Shanghai-GW(config-dial-peer)#session target sip-server
Shanghai-GW(config-dial-peer)#session protocol sipv2
Shanghai-GW(config-dial-peer)#dtmf-relay sip-notify rtp-nte
Shanghai-GW(config-dial-peer)#preference 1
!
Shanghai-GW(config)#dial-peer voice 2122 voip
Shanghai-GW(config-dial-peer)#destination-pattern 21255521..
Shanghai-GW(config-dial-peer)#session target 10.10.10.12
Shanghai-GW(config-dial-peer)#session protocol sipv2
Shanghai-GW(config-dial-peer)#dtmf-relay sip-notify rtp-nte
Shanghai-GW(config-dial-peer)#preference 2
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