[SIPForum-discussion] To-tag Change

Fri Feb 8 17:12:37 UTC 2008

Hi,

Do you think that is possible to change "To-tag" field in a 200ok message after receiving 18X message with to-tag?

The references aren't clear neither RFC3261 nor drafts (for example http://tools.ietf.org/id/draft-ietf-sipping-service-examples-13.txt).

In draft example 2.9 (call forwarding - no answer "sequential forking"), "To-tag" F5 message (180) is different than "To-tag" in F13 message (200ok), otherwise in RFC3261 the session is established with unique ID, this ID is composed of "From-tag", "Call-Id" and "To-tag". 

My Switch doesn't accept 200ok with different "To-tag" if previously has received a 180 message.

Can someone clarify this issue please? 

 Thanks,

José.