Cisco SPA525G Administration Guide - Page 207

SPA and Wireless IP Phone Field Reference SIP Tab B Parameter CTI Enable Caller ID Header SRTP Method Hold Target Before REFER Description The CTI interface allows a third-party application to control and monitor the state of a phone that has registered with the SPA9000. With this interface, an application can control a phone to initiate an outgoing call or answer an incoming call with a mouse click from a PC. Provides the option to take the caller ID from PAIDRPID-FROM, P-ASSERTEDIDENTITY, REMOTE-PARTYID, or FROM header. 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. 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. SIP Timer Values (sec) Parameter SIP T1 SIP T2 Description RFC 3261 T1 value (RTT estimate), which can range from 0 to 64 seconds. Defaults to .5 seconds. 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. Cisco SPA and Wireless IP Phone Administration Guide 205