[sr-dev] [tracker] Task opened: t_reply 302 redirects use wrong to-tag after fr_inv_timer fires (Attachment added)

[sip-router]

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User who did this - Andrew Mortensen (admorten) 

Attached to Project - sip-router
Summary - t_reply 302 redirects use wrong to-tag after fr_inv_timer fires
Task Type - Bug Report
Category - tm
Status - Assigned
Assigned To - Andrei Pelinescu-Onciul
Operating System - All
Severity - Medium
Priority - Normal
Reported Version - Development
Due in Version - Undecided
Due Date - Undecided
Details - If the failure route is armed and a call's fr_inv_timer fires following a 180 with to-tag from the callee, invoking t_reply("302", "Redirect") from the failure route does not use the to-tag from the callee. Instead, sip-router generates a new to-tag and attaches that to the 302 response. Our Polycom handsets then ignore the 302 because the to-tag does not match the to-tag it already received in the 180 from the callee. (Oddly, our Cisco gateways will happily redirect regardless of the unexpected to-tag in the 302. I suspect it has to do with a different reading of RFC3261 12.1 and 12.3.)

The attached patch stores the early dialog's to-tag in t->fwded_totags, and passes the winning to-tag into build_res_buf_from_sip_req in the _reply() routine. This ensures the correct to-tag is part of the final response, so the UAC considers it an in-dialog response, and redirects as instructed.

One or more files have been attached.

More information can be found at the following URL:
http://sip-router.org/tracker/index.php?do=details&task_id=152

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