Version 6.2 401 February 2011
SIP User's Manual 10. Configuration Parameters Reference
Parameter Description
Retransmission Parameters
Web: SIP T1
Retransmission Timer
[msec]
EMS: T1 RTX
[SipT1Rtx]
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.
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.
Web: SIP T2
Retransmission Timer
[msec]
EMS: T2 RTX
[SipT2Rtx]
The maximum interval (in msec) between retransmissions of SIP
messages.
The default is 4000.
Note: The time interval between subsequent retransmissions of the
same SIP message starts with SipT1Rtx and is multiplied by two until
SipT2Rtx.
Web: SIP Maximum RTX
EMS: Max RTX
[SIPMaxRtx]
Maximum number of UDP transmissions (first transmission plus
retransmissions) of SIP messages.
The range is 1 to 30. The default value is 7.
Web: Number of RTX
Before Hot-Swap
EMS: Proxy Hot Swap Rtx
[HotSwapRtx]
Number of retransmitted INVITE/REGISTER messages before the call
is routed (hot swap) to another Proxy/Registrar.
The valid range is 1 to 30. The default value is 3.
Note: This parameter is also used for alternative routing using the 'Tel
to IP Routing'. If a domain name in the table is resolved into two IP
addresses, and if there is no response for HotSwapRtx retransmissions
to the INVITE message that is sent to the first IP address, the device
immediately initiates a call to the second IP address.
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