RFC3261
Timer RFC3261 3GPP Meaning
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T1 500ms default 2 RTT Estimate
T2 4s 16 The maximum retransmit
interval for non-INVITE
requests and INVITE
responses
T4 5s 17 Maximum duration a
message will
remain in the network
Timer A initially T1 2 INVITE request retransmit
interval, for UDP only
Timer B 64*T1 128 INVITE transaction
timeout timer
Timer C > 3min 180 proxy INVITE transaction
timeout
Timer D > 32s for UDP 128 Wait time for response
0s for TCP/SCTP retransmits
Timer E initially T1 2 non-INVITE request
retransmit interval,
UDP only
Timer F 64*T1 128 non-INVITE transaction
timeout timer
Timer G initially T1 2 INVITE response
retransmit interval
Timer H 64*T1 128 Wait time for
ACK receipt
Timer I T4 for UDP 17 Wait time for
0s for TCP/SCTP ACK retransmits
Timer J 64*T1 for UDP 128 Wait time for
0s for TCP/SCTP non-INVITE request
retransmits
Timer K T4 for UDP 17 Wait time for
0s for TCP/SCTP response retransmits
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