Cisco SRP521W-K9-G1 Administration Guide - Page 126

6 126 Configuring Voice Configuring Voice Settings RTP Packet Size Max RTP ICMP Err RTCP Tx Interval No UDP Checksum Packet size in seconds, which can range from 0.01 to 0.16. Valid values must be a multiple of 0.01 seconds. The default is 0.030. Number of successive ICMP errors allowed when transmitting RTP packets to the peer before the SRP terminates the call. If value is set to 0, the SRP ignores the limit on ICMP errors. The default is 0. Interval for sending out RTCP sender reports on an active connection. It can range from 0 to 255 seconds. During an active connection, the SRP 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-softwareversion (such as Cisco/srp5201.0.31(b)). The NTP timestamp used in the SR is a snapshot of the SRP's local time, not the time reported by an NTP server. If the SRP receives a RR from the peer, it attempts to compute the round trip delay and show it as the value (ms) on the Voice > Info page. The default is 0. Select yes if you want the SRP to calculate the UDP header checksum for SIP messages. Otherwise, select no. The default is no. Cisco SRP500 Series Services Ready Platforms Administration Guide (SRP520 Models)