Operation Manual
Cisco SPA IP Phone Field Reference
Ext Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 302
A
Proxy and Registration
Parameter Description
Proxy  SIP proxy server and port number set by the Service 
Provider for all outbound requests. For example: 
192.168.2.100:6060. 
Outbound Proxy SIP Outbound Proxy Server where all outbound 
requests are sent as the first hop.
Use Outbound Proxy Enables an outbound proxy (for example, 
172.20.2.1:5060—port is optional) or a domain name 
such as sip.server.com as long as this name is a fully-
qualified domain name. If set to no, the Outbound 
Proxy and Use OB Proxy in Dialog fields are ignored. 
Defaults to no.
Optionally, the proxy can be configured (Cisco SPA500 
Series only) for Survivable Remote Site Telephony 
(SRST) support. The proxy is configured with an 
extension that includes a statically-configured DNS 
SRV record or DNS A record. Configuring the proxy 
allows for failover and fallback functionality with a 
secondary proxy server. For example:
For SRV Record:
sip.server.com:SRV=node1.sip.server.com
:5060:p=1:w=50|node2.sip.server.com:506
0:p=2:w=50
Set Use DNS SRV to no and DNS SRV Auto Prefix to 
no.
For A Record:
sip.server.com:A=172.20.2.1,172.20.2.2
Set Use DNS SRV to no and DNS SRV Auto Prefix to 
no.
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