Cisco 521SG - Unified IP Phone VoIP Administration Manual page 235

Cisco SPA IP Phone Field Reference
SIP Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
SRTP Method
Hold Target Before REFER
Keep Referee When REFER
Failed
Description
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
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
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>
A
Cisco WIP310
.
Cisco WIP310
.
234