Cisco 8800 Series Manual page 396

SIP Proxy and Registration for Extension Parameters
Parameter
Outbound Proxy
Alternate Proxy
Alternate Outbound Proxy
Cisco IP Phone 8800 Series Multiplatform Phone Administration Guide for Release 11.3(1) and Later
376
Description
Specifies an IP address or domain name. All outbound
requests are sent as the first hop.
• In the phone configuration file with
XML(cfg.xml), enter a string in this format:
<Outbound_Proxy_1_
ua="na">10.79.78.45</Outbound_Proxy_1_>
• In the phone web page, enter an IP address and
a domain name.
Default: Blank
This feature provides fast fall back 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.
• In the phone configuration file with
XML(cfg.xml), enter a string in this format:
<Alternate_Proxy_1_
u a = " n a " > 1 0 . 7 4 . 2 3 . 4 3 < / A l t e r n a t e _ P r o x y _ 1 _ > < A l t e r n a t e _ O u t b o u n d _ P r o x y _ 1 _
ua="na">10.74.23.44</<Alternate_Outbound_Proxy_1_>
• In the phone web page, 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 fall back
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.
Default: Blank
Cisco IP Phone Installation