Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 249
B
SIP Timer Values (sec)
SRTP Method Selects the method to use for SRTP. Two choices are
available:
•x-sipura—legacy SRPT method
• s-descriptor—new method compliant with RFC-
3711 and RFC-4568
The default value is "x-sipura.”
NOTE Not applicable to WIP310.
Hold Target Before REFER Controls whether to hold call leg with transfer target
before sending REFER to the transferee when initiating
a fully-attended call transfer (where the transfer target
has answered). Default value is "no,” where the call leg
is not held.
NOTE Not applicable to WIP310.
Keep Referee When REFER
Failed
Set this parameters to yes to configure the phone to
immediately handle NOTIFY sipfrag messages.
You can also configure this parameter in the
configuration file:
<Keep_Referee_When_REFER_Failed ua="na">Yes
</Keep_Referee_When_REFER_Failed>
Parameter Description
Parameter Description
SIP T1 RFC 3261 T1 value (RTT estimate), which can range
from 0 to 64 seconds. Defaults to .5 seconds.
SIP T2 RFC 3261 T2 value (maximum retransmit interval for
non-INVITE requests and INVITE responses), which can
range from 0 to 64 seconds. Defaults to 4 seconds.
SIP T4 RFC 3261 T4 value (maximum duration a message
remains in the network), which can range from 0 to 64
seconds. Defaults to 5 seconds.
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