Operation Manual
Cisco SPA IP Phone Field Reference
Ext Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 295
A
SIP Settings
Parameter Description
SIP Transport Select from UDP, TCP, or TLS.
Defaults to UDP.
SIP Port  Port number of the SIP message listening and 
transmission port.
Defaults to 5060. 
SIP 100REL Enable To enable the support of 100REL SIP extension for reliable 
transmission of provisional responses (18x) and use of 
PRACK requests, select yes. Otherwise, select no.
Defaults to no.
EXT SIP Port The external SIP port number. 
Auth Resync-
Reboot 
If this feature is enabled, the Cisco SPA9000 authenticates 
the sender when it receives the NOTIFY resync reboot 
(RFC 2617) message. To use this feature, select yes. 
Otherwise, select no.
Defaults to yes.
SIP Proxy-Require  The SIP proxy can support a specific extension or 
behavior when it sees this header from the user agent. If 
this field is configured and the proxy does not support it, it 
responds with the message, unsupported. Enter the 
appropriate header in the field provided.
SIP Remote-Party-
ID 
To use the Remote-Party-ID header instead of the From 
header, select yes. Otherwise, select no.
Defaults to yes.
Referor Bye Delay  Controls when the SPA9000 sends BYE to terminate stale 
call legs upon completion of call transfers. Multiple delay 
settings (Referor, Refer Target, Referee, and Refer-To 
Target) are configured on this screen. For the Referor Bye 
Delay, enter the appropriate period of time in seconds.
Defaults to 4.
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