Cisco 521SG Administration Guide - Page 112

Configuring SIP, SPCP, and NAT Configuring SIP 4 Configuring SDP Payload Types Configured dynamic payloads are used for outbound calls only when the Cisco IP phone presents a Session Description Protocol (SDP) offer. For inbound calls with a SDP offer, the phone follows the caller's assigned dynamic payload type. Cisco IP phones use the configured codec names in outbound SDP. For incoming SDP with standard payload types of 0-95, the Cisco IP phone ignores the codec names. For dynamic payload types, the Cisco IP phone identifies the codec by the configured codec names (comparison is case-sensitive). To configure SDP payload types, navigate to Admin Login > advanced > Voice > SIP. Under SDP Payload Types, configure these parameters: Parameter Description AVT Dynamic Payload Any non-standard data. Both sender and receiver must agree on a number. Ranges from 96 to 127. Defaults to 101. INFOREQ Dynamic Payload Codec number used in the SIP messaging for the Dynamic Payload size mechanism. This number should match the number configured in the network/other party to enable the use of Dynamic Payload. The best range is 96 to 27 for any dynamic payload type. Defaults to blank. G726r16 Dynamic Payload RTP Payload Type Number that indicates the transmitted packet is using the G.726 codec. Other codecs have preassigned payload numbers that you do not have to be set, but G.726 does not.. Ranges from 96 to 127. Defaults to 98. Not applicable to Cisco SPA525G or Cisco SPA525G2. G726r24 Dynamic Payload RTP Payload Type Number that indicates the transmitted packet is using the G.726-24 codec. Ranges from 96 to 127. Defaults to 97. Not applicable to Cisco SPA525G or Cisco SPA525G2. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 111