MediaPack SIP User’s Manual 5. Configuring the MediaPack
Version 4.6 55 June 2005
Table 5-1: Protocol Definition, General Parameters (continues on pages 52 to 55)
Parameter Description
Retransmission Parameters
SIP T1 Retransmission Timer
[msec]
[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.
SIP T2 Retransmission Timer
[msec]
[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.
SIP Maximum Rtx
[SIPMaxRtx]
Number of UDP retransmissions of SIP messages.
The range is 1 to 7.
The default value is 7.
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