Cisco 7960G Administration Manual page 181

Appendix D SIP IP Phone Parameters
Table D-4
Parameter
Outbound Proxy Port
OL-7890-01
Manual SIP Parameter Configuration (continued)
Cisco Unified IP Phone 7960G and 7940G Administration Guide for Release 8.0 (SIP)
Description
(Optional) Port number of the outbound proxy
server. Default is 5060.
When an outbound proxy is enabled, all SIP
requests are sent to the outbound proxy server
instead of to the proxyx_address. All responses
continue to reconcile the normal Via processing
rules. The media stream is not routed through the
outbound proxy.
NAT and outbound proxy modes can be
independently enabled or disabled. The received=
tag is added to the Via header of all responses if
there is no received= tag in the uppermost Via
header and if the source IP address is different
from the IP address in the uppermost Via header.
Keep the following rules in mind:
If a received= tag is in the uppermost Via
•
header, the response is sent back to the IP
address contained in the received= tag.
• If there is no received= tag and the IP address
in the uppermost Via header is different from
the source IP address, the response is sent
back to the source IP address.
D-23