[Sip-implementors] Payload type change "on the fly"

2012-10-29 Thread kumar.ramadoss
Hi *, During the SDP negotiation, in case a offer is made with more than 1 payload type (say 2), for which, if the answer also contains 2 payload types (as it supports both payload types), I presume it should be possible to change/switch the payload type "on the fly" at RTP level. If a Media Ga

Re: [Sip-implementors] Query on Transport parameter in Contact header

2012-08-23 Thread kumar.ramadoss
Thanks for the info. One follow-on query, see inline below KR> -Original Message- From: Brett Tate [mailto:br...@broadsoft.com] Sent: Thursday, August 23, 2012 4:22 PM To: Kumar Ramadoss (WT01 - GMT-Telecom Equipment); sip-implementors@lists.cs.columbia.edu Subject: RE: Query on Transpor

[Sip-implementors] Query on Transport parameter in Contact header

2012-08-23 Thread kumar.ramadoss
Hi *, Few queries on transport protocol to be used within the SIP dialog: * Is it acceptable to change the transport protocol (tcp, udp,..) for a new request within a SIP dialog? Assuming that the new request within the SIP dialog has size more than 1300 bytes and need to use TCP as tr

Re: [Sip-implementors] Offer/Answer model query

2012-07-27 Thread kumar.ramadoss
I hope this holds good, even if there is change of offer/answer in between (18X reliable & 200 ok). My doubt is that, the UAS can still send the same session description in 200 ok (of Invite) as in 18x (reliable). This session description could be different from what was exchanged previously usi

[Sip-implementors] Offer/Answer model query

2012-07-27 Thread kumar.ramadoss
Hi *, Whether below mentioned scenarios correct from Offer/Answer model point of view ? 1. INVITE/18x (Reliable) for Offer/Answer1. 200 OK (INVITE)/ACK for Offer/Answer2. 2. INVITE/18x (Reliable) for Offer/Answer1. PRACK/200 OK (PRACK) for Offer/Answer2. 200 OK (INVITE)/ACK for O

[Sip-implementors] M line ordering in Re-invite SDP for Inter domain fax call

2012-05-10 Thread kumar.ramadoss
Hi *, For the inter domain fax call (for a SIP <-> PSTN call), after the basic call setup, in case of fax tone detection at the Media Gateway, a new offer SDP shall be sent to the remote party using Re-invite. This new offer SDP should abide by the rules defined in RFC 3264. This SDP normally

[Sip-implementors] Query on unreliable provisional Response

2011-02-24 Thread kumar.ramadoss
Hi all, Is it OK to send unreliable provisional response, while waiting for PRACK for a already sent provisional response?? According to RFC 3262, it has been explicitly mentioned that reliable provisional response should not be sent, while waiting for PRACK for a already sent provisional re