Linksys WIP310 SPA500 Series and WIP310 IP Phone Administration Guide - Page 103

Configuring SIP, SPCP, and NAT Configuring SIP 4 • Symmetric RTP-Enable symmetric RTP operation. If enabled, sends RTP packets to the source address and port of the last received valid inbound RTP packet. If disabled (or before the first RTP packet arrives) sends RTP to the destination as indicated in the inbound SDP. Defaults to no. • Stats in BYE-Determines whether the IP phone includes the P-RTP-Stat header or response to a BYE message. The header contains the RTP statistics of the current call. Select yes or no from the drop-down menu. The format of the P-RTP-Stat header is: P-RTP-State: PS=,OS=,PR=,OR=,PL=,JI=,LA=,DU=,EN=,DE= Defaults to no. STEP 5 Click Submit All Changes. Configuring SDP Payload Types Configured dynamic payloads are used for outbound calls only when the Cisco IP phone presents an SDP offer. For inbound calls with an 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: STEP 1 Log in to the web administration interface. STEP 2 Click Admin Login and advanced. STEP 3 Click the SIP tab. STEP 4 Under SDP Payload Types, configure the fields shown in the following table and click Submit All Changes. Cisco SPA 500 Series and WIP310 IP Phone Administration Guide 92