Cisco SPA509G Administration Guide - Page 109

Configuring SIP, SPCP, and NAT Configuring SIP 4 Parameter Description CTI Enable If set to yes, enables the computer telephony integration (CTI), where a computer can act as a call center handling all sorts of incoming and outgoing communications., including phone calls, faxes, and text messages. The CTI interface allows a third-party application to control and monitor the state of a Cisco IP phone and, for example, initiate or answer a call by clicking a mouse on a PC, NOTE CTI must be enabled on the Cisco SPA300 Series or Cisco SPA500 Series IP Phones for an attached Cisco SPA500S to properly monitor the IP phone's line status. If setting up a Cisco SPA500S, see Chapter 9, "Configuring the Cisco SPA500S Attendant Console." Defaults to no. Caller ID Header Select where the IP phone gets its caller ID from: PAID-RPID-FROM P-ASSERTED-IDENTITY REMOTE-PARTY-ID FROM header Defaults to PAID-RPID-FROM. NOTE Not applicable to the WIP310. 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. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 108