Cisco 521SG Administration Guide - Page 236
SIP Timer Values (sec), SIP Timer F
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Cisco SPA IP Phone Field Reference SIP Tab A SIP Timer Values (sec) Parameter SIP T1 SIP T2 SIP T4 SIP Timer B SIP Timer F SIP Timer H SIP Timer D SIP Timer J INVITE Expires Description RFC 3261 T1 value (RTT estimate) that can range from 0 to 64 seconds. Defaults to .5 seconds. RFC 3261 T2 value (maximum retransmit interval for non-INVITE requests and INVITE responses) that can range from 0 to 64 seconds. Defaults to 4 seconds. RFC 3261 T4 value (maximum duration a message remains in the network) that can range from 0 to 64 seconds. Defaults to 5 seconds. INVITE time-out value that can range from 0 to 64 seconds. Defaults to 16 seconds. Non-INVITE time-out value that can range from 0 to 64 seconds. Defaults to 16 seconds. INVITE final response, time-out value that can range from 0 to 64 seconds. Defaults to 16 seconds. ACK hang-around time that can range from 0 to 64 seconds. Defaults to 16 seconds. Non-INVITE response hang-around time that can range from 0 to 64 seconds. Defaults to 16 seconds. INVITE request Expires header value. If you enter 0, the Expires header is not included in the request. Ranges from 0 to 19999999999999999999999999999999. Defaults to 240 seconds. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 235