Proxy And Registration - Cisco SPA301 Administration Manual

Cisco SPA IP Phone Field Reference
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Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide

Proxy and Registration

Parameter
Proxy
Outbound Proxy
Alternate Proxy
Alternate Outbound
Proxy
Description
SIP proxy server and port number set by the Service
Provider for all outbound requests. For example:
192. 1 68.2. 1 00:6060.
SIP Outbound Proxy Server where all outbound
requests are sent as the first hop.
These fields are used with the Verizon dual
registration/fast fallback feature. This feature provides
fast fallback when there is network partition at the
Internet or when the primary proxy (or primary
outbound proxy) is not responsive or available. The
feature works well in a Verizon deployment
environment as the alternate proxy is the Integrated
Service Router (ISR) with analog outbound phone
connection.
Enter the proxy server addresses and port numbers in
these fields. After the phone is registered to the
primary proxy and the alternate proxy (or primary
outbound proxy and alternate outbound proxy), the
phone always sends out INVITE and Non-INVITE SIP
messages (except registration) via the primary proxy.
The phone always registers to both the primary and
alternate proxies. If there is no response from the
primary proxy after timeout (per the SIP RFC spec) for
a new INVITE, the phone attempts to connect with the
alternate proxy. The phone always tries the primary
proxy first, and immediately tries the alternate proxy if
the primary is unreachable.
Active transactions (calls) never fall back between the
primary and alternate proxies. If there is fallback for a
new INVITE, the subscribe/notify transaction will fall
back accordingly so that the phone's state can be
maintained properly.
You must also set Dual Registration in the Proxy and
Registration section to yes.
A
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