Linksys SPA921 Cisco SPA9000 Voice System Administration Guide - Page 210
SDP Payload Types most circumstances.
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SPA9000 Field Reference Voice tab B RTCP Tx Interval No UDP Checksum Stats In BYE Interval for sending out RTCP sender reports on an active connection. It can range from 0 to 255 seconds. During an active connection, the SPA9000 can be programmed to send out compound RTCP packet on the connection. Each compound RTP packet except the last one contains a SR (Sender Report) and a SDES.(Source Description). The last RTCP packet contains an additional BYE packet. Each SR except the last one contains exactly 1 RR (Receiver Report); the last SR carries no RR. The SDES contains CNAME, NAME, and TOOL identifiers. The CNAME is set to @, NAME is set to (or Anonymous if user blocks caller ID), and TOOL is set to the Vendor/Hardware-platform-software-version (such as Linksys/SPA9000-1.0.31(b)). The NTP timestamp used in the SR is a snapshot of the SPA9000's local time, not the time reported by an NTP server. If the SPA9000 receives a RR from the peer, it attempts to compute the round trip delay and show it as the value (ms) in the Info section of SPA9000 web page. Default: 0 Select yes if you want the SPA9000 to calculate the UDP header checksum for SIP messages. Otherwise, select no. Default: no Determines whether the SPA9000 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=. Default: no Voice tab > SIP page SDP Payload Types section The SDP Payload types defines the naming/numbering conventions for the audio codecs used by the SPA9000 when communicating with the ITSP network. Naming should match the ITSP names used. The default values are adequate in most circumstances. These settings need to be compatible with the ITSP network settings. The ITSP you use will inform you about any specific setting you need to modify on these areas. These parameters have impact on the signaling and audio reliability. SPA9000 Voice System Administration Guide 208