AudioCodes 420HD - Configuring SIP Timers; Figure 17-7: Web Interface - Signaling Protocols - SIP Timers; Table 17-6: SIP Timers Parameters

400HD Series IP Phones
Administrator's Manual 104 Document #: LTRT-11950
17.5 Configuring SIP Timers
SIP Timers can be configured using the Web interface or Configuration File.
 To configure SIP timer settings using the Web interface:
1. Access the Signaling Protocol page (Configuration tab > Voice Over IP menu >
Signaling Protocols).
Figure 17-7: Web Interface - Signaling Protocols - SIP Timers
2. Configure the SIP Timers parameters using the table below as reference, and then click
Submit.
 To configure SIP timer settings using the Configuration File:
• Use the table below as reference.
Table 17-6: SIP Timers Parameters
Parameter Description
Retransmission Timer T1
[voip/signalling/sip/sip_t1]
The time interval (in msec) between the first
transmission of a SIP message and the first
retransmission of the same message (according to RFC
3261).
The valid range is 100 to 60000. The default value is
500.
Note: The time interval between subsequent
retransmissions of the same SIP message starts with
SipT1Rtx and is multiplied by two until SipT2Rtx. For
example (assuming that SipT1Rtx = 500 and SipT2Rtx =
4000):
 The first retransmission is sent after 500 msec.
 The second retransmission is sent after 1000 (2*500)
msec.
 The third retransmission is sent after 2000 (2*1000)
msec.
 The fourth retransmission and subsequent
retransmissions until SIPMaxRtx are sent after 4000
(2*2000) msec.
Note also:
If dual registration / redundant Genesys server is
configured and the configuration file parameter
'voip/signalling/sip/redundant_proxy/dual_reg/t1' is then
configured, its value will override 'Retransmission Timer
T1'. See also Section A.3.17 and Section A.3.17.1.