hi, Thanks Shanbhag and Aman for your answers...
@Aman, does that mean a stateless proxy cannot detect retransmitted messages from the existing protocol? Regards, Vineet Menon On 30 April 2012 11:26, Aman Aggarwal <[email protected]> wrote: > Hi Vineet, > > Stateless proxy cannot distinguish a retransmission since it does not > maintain any transaction. For stateless proxy, RFC 3261 states that > > 16.11 Stateless Proxy > > When acting statelessly, a proxy is a simple message forwarder. Much > of the processing performed when acting statelessly is the same as > when behaving statefully. The differences are detailed here. > > A stateless proxy does not have any notion of a transaction, or of > the response context used to describe stateful proxy behavior. > Instead, the stateless proxy takes messages, both requests and > responses, directly from the transport layer (See section 18). As a > result, stateless proxies do not retransmit messages on their own. > They do, however, forward all retransmissions they receive (they do > not have the ability to distinguish a retransmission from the > original message). > > regards, > Aman Aggarwal > Aricent > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Shanbhag, > Somesh (NSN - IN/Bangalore) > Sent: Monday, April 30, 2012 10:59 AM > To: ext Vineet Menon; [email protected] > Subject: Re: [Sip-implementors] detect retransmitted messages.. > > Hi Vineet, > > As far as stateful transaction is concerned, I think, call-id would give a > clear enough picture of a retransmitted message, but what if it's a new > invite for capability negotitation??? > > [Answer] The re-INVITE shall have the incremented CSeq number and the > retransmission shall not have. > This is because retransmission is normally done by Transaction > layer in Stateful case. > > Regards, > Somesh > > > -----Original Message----- > From: [email protected] on behalf of ext > Vineet Menon > Sent: Mon 4/30/2012 10:32 AM > To: [email protected] > Subject: [Sip-implementors] detect retransmitted messages.. > > Hi, > > I wanted to know is there a way to detect a retransmitted message in a > stateless and statefull proxy? > > As far as stateful transaction is concerned, I think, call-id would give a > clear enough picture of a retransmitted message, but what if it's a new > invite for capability negotitation??? > > How to detect this in a stateless transaction?? > > > Regards, > > Vineet Menon > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > _______________________________________________ > Sip-implementors mailing list > [email protected] > https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors > > > > > > =============================================================================== > Please refer to http://www.aricent.com/legal/email_disclaimer.html > for important disclosures regarding this electronic communication. > > =============================================================================== > _______________________________________________ Sip-implementors mailing list [email protected] https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
