Cisco SPA501G Administration Guide - Page 107
Configuring SIP Timer Values
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Configuring SIP, SPCP, and NAT Configuring SIP 4 Parameter Hold Target Before REFER Dialog SDP Enable Display Diversion Info Description Controls whether to hold call leg with transfer target before sending REFER to the transferee when initiating a fullyattended call transfer (where the transfer target has answered). Default value is "no," where the call leg is not held. Not applicable to Cisco WIP310. When enabled and the Notify message body is too big causing fragmentation, the Notify message xml dialog is simplified; Session Description Protocol (SDP) is not included in the dialog xml content. Parses Diversion Header information in an incoming SIP Invite and displays it as the Caller ID. Configuring SIP Timer Values All SIP timer values are in seconds. To configure SIP timer values, navigate to Admin Login > advanced > Voice > SIP. Under SIP Timer Values (sec), make these changes: Parameter SIP T1 SIP T2 SIP T4 SIP Timer B SIP Timer F Description RFC-3261 T1 value (RTT estimate). Ranges from 0 to 64 seconds. Defaults to .5 seconds. RFC-3261 T2 value, the maximum retransmit interval for non-INVITE requests and INVITE responses. Ranges from 0 to 64 seconds. Defaults to 4 seconds. RFC-3261 T4 value, which is the maximum duration a message remains in the network. Ranges from 0 to 64 seconds. Defaults to 5 seconds. RFC-3261 INVITE transaction time-out value. Ranges from 0 to 64 seconds. Defaults to 16 seconds. RFC-3261 Non-INVITE transaction time-out value. Ranges from 0 to 64 seconds. Defaults to 16 seconds. Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 106