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Administrator's Manual
5. Configuring VoIP Settings
Version 3.4.3
71
400HD Series IP Phones
5.1.5 Configuring SIP Timers
SIP Timers can be configured.
To configure SIP timer settings:
•
Use the table as reference.
Table 5-8: SIP Timers Parameters
Parameter
Description
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
and Section
voip/signalling/sip/redundant_proxy/dual
_reg/t1
Only relevant if dual registration / redundancy server is
configured. Allows quicker retransmission of SIP
messages. Default: 20 milliseconds. Range: 20-200.
voip/signalling/sip/sip_t2
The maximum interval (in msec) between
retransmissions of SIP messages (according to RFC
3261).
The valid range is 4000 to 60000.
The default value is 4000.
Note:
The time interval between subsequent
retransmissions of the same SIP message starts with
SipT1Rtx and is multiplied by two until SipT2Rtx.
voip/signalling/sip/sip_t4
The SIP T4 retransmission timer according to RFC
3261.
The valid range is 5000 to 60000.
The default value is 5000.
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