[prev in list] [next in list] [prev in thread] [next in thread] 

List:       sip-implementors
Subject:    RE: [Sip-implementors] 200 OK retransmissions for INVITE
From:       feng zhang <y01317 () njupt ! edu ! cn>
Date:       2002-08-25 1:02:19
Message-ID: 200208250055.g7P0t3KK004176 () cs ! columbia ! edu
[Download RAW message or body]

Hi,

  Please see below:

>Let me refrase the Amihai's question:
>The scenario is:
>UAC ------> INVITE UAS
>UAC <------ 200 OK UAS (Timer H started)
                         ~~~~~~~~~~~~~~~Why? Once "200 OK" is sent to transport 
                                        layer,the INVITE server transaction is 
                                        *destroyed* then, in RFC3261, no Timer is
                                        set for this "200 OK", the work is done by
                                        TU. So I think there is no transaction matching
                                        the retransmitted INVITE, then it is passed to
                                        the TU, the TU will take it as a new INVITE. 
>UAC <-------200 OK (retransmited) UAS
>UAC ------> INVITE(retransmited) UAS
>
>1.On receving the retransmited INVITE should retry mechnism start again
>ignoring what sent till now and timer H should be restarted when sending the
>OK?
>If not:
>2.On receving the retransmited INVITE you should immediatley response with
>200 OK does this 200 OK is counted as one of the retransmissions
>and the UAS should move to count the next interval (of the 200 OK
>retransmission)?
>
>Matan.
>
>-----Original Message-----
>From: Christer Holmberg [mailto:christer.holmberg@lmf.ericsson.se]
>Sent: Tuesday, August 13, 2002 4:25 PM
>To: Fuxbruner Amihay
>Cc: sip-implementors@cs.columbia.edu; Barth Matan
>Subject: Re: [Sip-implementors] 200 OK retransmissions for INVITE
>
>
>
>Hi,
>
>> 3261 implies 200 OK retransmissions for INVITE till we get ACK.
>> However, in case we get INVITE retransmission, what is the recommended
>> way:
>>
>> 1. Stop the 200 OK retransmissions and handle new retransmission for
>> the new incoming INVITE.
>> 2. Continue the 200 OK retransmission for the first INVITE.
>> Any other ?
>
>If the INVITE is a retranmission of the first INVITE you just continue
>the 200 OK retransmission.
>
>Regards,
>
>Christer Holmberg
>Ericsson Finland
>
>
>
>>
>>
>> Thanks,
>>
>> Amihay Fuxbruner
>> System Engineering - Signaling R&D
>> Comverse

[prev in list] [next in list] [prev in thread] [next in thread]