Hi!


Please, correct me if I wrong.

draft-ietf-sip-rfc2543bis-09.txt

17.1.1.2

There are two timers A and B, first one for retransmissions and multiplies
each time by 2

starting from 500 ms and second one for transaction timeout and set to
64*500 and that amount of time is enough to retransmit request 7 times.



Let see what happens:

Time

0             INVITE1 (retransmit after 500)

500         INVITE2 (retransmit after 1000)

1500       INVITE3 (retransmit after 2000)

3500       INVITE4 (retransmit after 4000)

7500       INVITE5 (retransmit after 8000)

15500     INVI TE6 (retransmit after 16000)

31500     INVITE7 (do not retransmit)

32000     Transaction Timeout (Transaction terminated)



It means that INVITE7 have only 500 ms to be responded.

Is that correct?

If correct why after 1,2,4,8,16 seconds waiting we need one more half second
wait?



Sergey.


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