> Dear All:
> I want to consult one question about ACK request,
> according to the protocol,ACK will nerver
> retransmitted.
> Then my question is: If Use Agent A receive
> retransmitted 200 OK response twice via UDP, should
> ACK request be sent out twice passively? the protocols
Yes.
One purpose of ACK is to stop retransmission of final
responses to INVITE. So UAS retransmits 200 OK for INVITE
until it receives ACK (or timeout). If the first
ACK sent by UAC is lost, UAS retranmits 200 OK, UAC
sends another ACK, which when received by UAS
stops retranmission of 200 OK.
Kundan
> only says that ACK will never be retransmitted
> actively. I think under this situation, ACK will be
> sent out twice, according to the same reason, if 200
> response received three times, then ACK will be sent
> out three times.
> Is my understanding right, please give me some
> suggestion to confirm it!
> Thanks in advance!
> Yours: james
>
>
>
>
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