> Simple Scenario: > > SIP > CS1000 ------------------SIPX > | | | > setA setB setX > > - setA and setB are connected to CS1000 and setX is connected to SIPX. > > Actions: > --------- > 1. setA calls setB. > 2. setA initiates a No Hold Conference to setX. > > This problematic scenario can also be simulated using SIPp > tool (without CS1000 and without NHC scenario). Construct a > simulated INVITE without SDP using "SIPp tool" and send it > across to SIPX, you might be able to observe the results yourself.
I suspect that setX does not support "Slow start" then. A simple network trace would confirm that. > > > -----Original Message----- > From: JOLY, ROBERT (ROBERT) [mailto:[email protected]] > Sent: Tuesday, March 23, 2010 7:15 PM > To: Bharath Ramalingam (WT01 - Telecom Equipment); > [email protected] > Subject: RE: SLOW START on SIPX > > > Thanks Joly for your response. > > > > As mentioned earlier, it's a "No Hold Conference" (NHC) > scenario from > > CS1000 to endpoint connected to SIPX i.e. > > without putting the present call on hold, conference will > initiate. In > > > such case, CS1000 would send out INVITE message without SDP > > information and when far end responds with the '200 OK', the SDP > > information would be sent in 'ACK' message. > > But when the far end is SIPX, it rejects the INVITE without > SDP with > > "500 internal Server Error". > > What do you mean by 'the far end is SIPX'. You were just > explaining that the scenario is between CS1K to an endpoint > connected to sipXecs. > Please describe failing scenario - that would be one where > the far-end is a component of sipX, not CS1K or a phone > connected to sipX. > > > > Our understanding it > > that this problem happens due to lack of 'slow start' or late media > > support on SIPX. > > > > I am not sure if we are missing any configuration for 'slow > start' to > > be supported on SIPX. > > > > If not without CS1000, this issue can be reproduced by the standard > > "SIPp tool" to generate INVITE without SDP to SIPX. > > We tried using SIPp as well and received "500 Internal > Server Error" > > from SIPX, after which we understood that this problem > could be due to > > > lack of 'slow start' > > implementation on SIPX. Please see if the attached traces > help you to > > identify the cause for the problem. > > > > Thanks for your time. > > > > Regards > > Bharath > > > > -----Original Message----- > > From: JOLY, ROBERT (ROBERT) [mailto:[email protected]] > > Sent: Tuesday, March 23, 2010 6:33 PM > > To: Bharath Ramalingam (WT01 - Telecom Equipment); > > [email protected] > > Subject: RE: SLOW START on SIPX > > > > > > > > > > > > We have few doubts regarding Slow Start (or late media) > support on > > > SIPX for which we need your views. > > > > > > > > > > > > As per observation, SIPX does not support SLOW START i.e. if it > > > receives INVITE message without SDP in the first request, > it would > > > reject with "500 Server Internal Error". There are few > > Avaya's CS1000 > > > scenarios such as "No Hold Conference", "MobileX Hand off" and > > > "MobileX RGA support" in which CS1000 would send out > INVITE message > > > without SDP (Slow Start case, where SDP would present in > > the 'ACK' to > > > '200 OK' from far > > > end) and this is rejected by SIPX. > > > > The sipX SIP routing core does not care about "slow start" or "fast > > start". If you see 500 Server Internal Error, it must be > generated by > > > the UAS that is the target of the call. > > Please be a lot more specific about the failing scenario so that we > > can identify the endpoints in play. > > > > > > > > > > > > > This scenario is also tested generically by sending out > > INVITE without > > > SDP using "Sip tool" and SIPX rejected it with "500 > Internal Server > > > Error". > > > > > > > > > > > > Can you please confirm if SIPX does not support Slow Start > > scenarios? > > > As per initial investigations, we understand that this > > would require > > > considerable changes to be done on SIPX end to support > Slow Start. > > > Please provide your views and if there is any reason > behind lack of > > > Slow Start support on SIPX. > > > > > > > > > > > > Thanks a lot for your time. > > > > > > > > > > > > Regards > > > > > > Bharath > > > > > > Please do not print this email unless it is absolutely necessary. > > > > > > The information contained in this electronic message and any > > > attachments to this message are intended for the exclusive > > use of the > > > addressee(s) and may contain proprietary, confidential or > > privileged > > > information. 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The > recipient should check this email and any attachments for the > presence of viruses. The company accepts no liability for any > damage caused by any virus transmitted by this email. > > www.wipro.com > _______________________________________________ sipx-dev mailing list [email protected] List Archive: http://list.sipfoundry.org/archive/sipx-dev Unsubscribe: http://list.sipfoundry.org/mailman/listinfo/sipx-dev sipXecs IP PBX -- http://www.sipfoundry.org/
