Hi people,
I am trying to search for the RFC behavior in case of 180/200 to tag mismatch of an INVITE. From my readings so far, I'm not 100% convinced of the correct behavior.
However, there may be a scenario, where this might be plausible: 1. parallel forked two calls 2. 180 ringing comes for first one, but not for second one(various reasons) 3. 200 ok comes for second one
Any opinions about this? Do you have some references that will make this 100% clear?
Thank you, Stefan
Hello,
On 06.03.18 17:24, Mititelu Stefan wrote:
Hi people,
I am trying to search for the RFC behavior in case of 180/200 to tag mismatch of an INVITE. From my readings so far, I'm not 100% convinced of the correct behavior.
However, there may be a scenario, where this might be plausible:
- parallel forked two calls
- 180 ringing comes for first one, but not for second one(various
reasons) 3. 200 ok comes for second one
Any opinions about this? Do you have some references that will make this 100% clear?
the UA has to take the tag from 200ok. Provisional responses are not mandatory, one can just send directly 200ok. Different tags can come due to serial or parallel forking, the the UA must be prepared to handle branches of its call until the 200ok is received and then use it to complete the dialog.
Cheers, Daniel
Hi Daniel,
Thank you for making this clear!
Also I have just found [1] (second paragraph) that enforces what you said.
--- Stefan
[1] https://tools.ietf.org/html/rfc3261#section-13.2.2.4
On Wed, Mar 7, 2018 at 9:43 AM, Daniel-Constantin Mierla miconda@gmail.com wrote:
Hello,
On 06.03.18 17:24, Mititelu Stefan wrote:
Hi people,
I am trying to search for the RFC behavior in case of 180/200 to tag mismatch of an INVITE. From my readings so far, I'm not 100% convinced of the correct behavior.
However, there may be a scenario, where this might be plausible:
- parallel forked two calls
- 180 ringing comes for first one, but not for second one(various
reasons) 3. 200 ok comes for second one
Any opinions about this? Do you have some references that will make this 100% clear?
the UA has to take the tag from 200ok. Provisional responses are not mandatory, one can just send directly 200ok. Different tags can come due to serial or parallel forking, the the UA must be prepared to handle branches of its call until the 200ok is received and then use it to complete the dialog.
Cheers, Daniel
-- Daniel-Constantin Mierla www.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - March 5-7, 2018, Berlin - www.asipto.com Kamailio World Conference - May 14-16, 2018 - www.kamailioworld.com
-
Daniel-Constantin Mierla -
Mititelu Stefan