SIP tags

15 pts.
Tags:
SIP
UAS
Is a UAS required to use the same To: tag in a 487 response as was used in the 180/187. Scenario: A user INVITES B, B sends 183 (with To: tag filled in), then user A CANCELS B, B sends 487 with different To: tag
ASKED: February 4, 2009  10:07 PM
UPDATED: February 6, 2009  7:38 AM

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Hi,

The UAS should use the same To tag used in 180/183/187 response. Because based on the tags only the UA’s can identify the dialog. In case of proxy is in between UAC & UAS, the proxy can change the To tag in both 200 OK & 487 of the CANCEL.

Best Regards,
Balaji

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