Linksys SPA-841 Cisco SPA9000 Voice System Administration Guide - Page 206
SIP Timer Values sec Mark All AVT Packets
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SPA9000 Field Reference Voice tab B RFC 2543 Call Hold Mark All AVT Packets SIP TCP Port Min SIP TCP Port Max If set to yes, unit will include c=0.0.0.0 syntax in SDP when sending a SIP re-INVITE to the peer to hold the call. If set to no, unit will not include the c=0.0.0.0 syntax in the SDP. The unit will always include a=sendonly syntax in the SDP in either case. Default: yes If set to yes, all AVT tone packets (encoded for redundancy) have the marker bit set. If set to no, only the first packet has the marker bit set for each DTMF event. Default: yes The lowest TCP port number that can be used for SIP sessions. Default: 5060 The highest TCP port number that can be used for SIP sessions. Default: 5080 Voice tab > SIP page SIP Timer Values (sec) section SIP T1 SIP T2 SIP T4 SIP Timer B SIP Timer F RFC 3261 T1 value (RTT estimate), which can range from 0 to 64 seconds. Default: .5 RFC 3261 T2 value (maximum retransmit interval for nonINVITE requests and INVITE responses), which can range from 0 to 64 seconds. Default: 4 RFC 3261 T4 value (maximum duration a message remains in the network), which can range from 0 to 64 seconds. Default: 5 RFC 3261 INVITE transaction time-out value, which can range from 0 to 64 seconds. Default: 32 RFC 3261 Non-INVITE transaction time-out value, which can range from 0 to 64 seconds. Default: 32 SPA9000 Voice System Administration Guide 204