Cisco Cisco Customer Voice Portal 8.0(1) Design Guide
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Cisco Unified Customer Voice Portal (CVP) 8.x Solution Reference Network Design (SRND)
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Chapter 4 Designing Unified CVP for High Availability
SIP Proxy
Cisco IOS Gateway Configuration
With Cisco IOS gateways, dial-peers are used to match phone numbers, and the destination can be a SIP
Proxy Server, DNS SRV, or IP address. The following example shows a Cisco IOS gateway configuration
to send calls to a SIP Proxy Server using the SIP Proxy's IP address.
Proxy Server, DNS SRV, or IP address. The following example shows a Cisco IOS gateway configuration
to send calls to a SIP Proxy Server using the SIP Proxy's IP address.
sip-ua
sip-server ipv4:10.4.1.100:5060
dial-peer voice 1000 voip
session target sip-server
...
The sip-server command on the dial-peer tells the Cisco IOS gateway to use the globally defined
sip-server that is configured under the sip-ua settings. In order to configure multiple SIP Proxies for
redundancy, you can change the IP address to a DNS SRV record, as shown in the following example.
The DNS SRV record allows a single DNS name to be mapped to multiple servers.
sip-server that is configured under the sip-ua settings. In order to configure multiple SIP Proxies for
redundancy, you can change the IP address to a DNS SRV record, as shown in the following example.
The DNS SRV record allows a single DNS name to be mapped to multiple servers.
sip-ua
sip-server dns:cvp.cisco.com
dial-peer voice 1000 voip
session target sip-server
...
Alternatively, you can configure multiple dial-peers to point directly at multiple SIP Proxy servers, as
shown in the following example. This configuration allows you to specify IP addresses instead of relying
on DNS.
shown in the following example. This configuration allows you to specify IP addresses instead of relying
on DNS.
dial-peer voice 1000 voip
session target ipv4:10.4.1.100
preference 1
...
dial-peer voice 1000 voip
session target ipv4:10.4.1.101
preference 1
...
In the preceding examples, the calls are sent to the SIP Proxy server for dial plan resolution and call
routing. If there are multiple Unified CVP Call Servers, the SIP Proxy server would be configured with
multiple routes for load balancing and redundancy. It is possible for Cisco IOS gateways to provide load
balancing and redundancy without a SIP Proxy Server. The following example shows a Cisco IOS
gateway configuration with multiple dial-peers so that the calls are load-balanced across three Unified
CVP Call Servers.
routing. If there are multiple Unified CVP Call Servers, the SIP Proxy server would be configured with
multiple routes for load balancing and redundancy. It is possible for Cisco IOS gateways to provide load
balancing and redundancy without a SIP Proxy Server. The following example shows a Cisco IOS
gateway configuration with multiple dial-peers so that the calls are load-balanced across three Unified
CVP Call Servers.
dial-peer voice 1001 voip
session target ipv4:10.4.33.131
preference 1
...
dial-peer voice 1002 voip
session target ipv4:10.4.33.132
preference 1
...
dial-peer voice 1003 voip
session target ipv4:10.4.33.133
preference 1
...
DNS SRV records allow an administrator to configure redundancy and load balancing with finer
granularity than with DNS round-robin redundancy and load balancing. A DNS SRV record allows you
to define which hosts should be used for a particular service (the service in this case is SIP), and it allows
granularity than with DNS round-robin redundancy and load balancing. A DNS SRV record allows you
to define which hosts should be used for a particular service (the service in this case is SIP), and it allows