> 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. If you are not the intended recipient, you should not > > disseminate, distribute or copy this e-mail. Please notify > the sender > > immediately and destroy all copies of this message and any > > attachments. > > > > WARNING: Computer viruses can be transmitted via email. 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 > > > > > > 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. If you are not the > intended recipient, you should not disseminate, distribute or > copy this e-mail. Please notify the sender immediately and > destroy all copies of this message and any attachments. > > WARNING: Computer viruses can be transmitted via email. 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/
