3Com VCX v7111 User Manual page 73

Parameter
SIP T1 Retransmission Timer [msec]
[ SipT1Rtx ]
SIP T2 Retransmission Timer [msec]
[ SipT2Rtx ]
SIP Maximum Rtx
[ SIPMaxRtx]
EnableReasonHeader
[Enable Reason Header]
Proxy & Registration Parameters
Use this screen to configure parameters that are associated with Proxy and Registration.
To configure the Proxy & Registration parameters:
Open the Proxy & Registration parameters screen (Protocol Management menu >
1
Protocol Definition submenu > Proxy & Registration option); the Proxy & Registration
parameters screen is displayed.
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3Com VCX V7111 VoIP Gateway User Guide
Description
The time interval (in msec) between the first transmission of a SIP
message and the first retransmission of the same message.
The default is 500.
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.
The maximum interval (in msec) between retransmissions of SIP
messages. The default is 4000.
The time interval between subsequent retransmissions of
the same SIP message starts with SipT1Rtx and is
multiplied by two until SipT2Rtx.
Number of UDP transmissions (first transmission + retransmissions)
of SIP messages.
The range is 1 to 7.
The default value is 7.
Enables / disables the usage of the SIP Reason header.
[0] = Disable.
[1] = Enable (default).
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