----- Original Message -----
From: "A Venkatraman" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, November 15, 2001 10:43 AM
Subject: [Sip-implementors] How does forking proxy handle To Tag in error
response selection?
> Suppose a proxy forks a request from UAC to uas1, uas2,
> and each returns a 18x, with tag u1 and u2 respectively, which are
> forwarded, as is, to UAC,
> and then uas1 returns a 486 with tag u1 and uas2 returns 500 with tag u2
> Proxy picks best response 486 to return to UAC.
>
> Question:
> Will the TO tag in the 486 reponse be u1? Or, will there be no TO tag.
> Is this implementation specific or does the protocol specify this
anywhere?
>
Based on section 16.6 on bis-05, the tag received in the response is
preserved when the selected response is forwarded to the UAC. Therefore, it
would be u1 for your example. The proxy is not allowed to modify the To
header in the forwarded response.
>
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