[OpenSIPS-Devel] [ opensips-Bugs-3338085 ] b2b: failed attended transfer (improper REFER handling)

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Bugs item #3338085, was opened at 2011-06-27 14:40
Message generated for change (Tracker Item Submitted) made by osas
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Category: modules
Group: 1.6.x
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Ovidiu Sas (osas)
Assigned to: Nobody/Anonymous (nobody)
Summary: b2b: failed attended transfer (improper REFER handling)

Initial Comment:
When an attended call transfer is in progress, a REFER is sent by the transferor.
The REFER is carrying a "Refer-To" SIP header and the URI of the "Refer-To" SIP header has a "Replaces" URI header.
The "Replaces" URI header has the values of the callid and to/from tag of the call to be transfered-to.  The issue here is that the callid and to/from tag of the call on the transferor side are different then the callid and to/from tag of the call on the server side.
When the b2b modules is receiving a REFER with a "Replaces" URI header inside the "Refer-To SIP header, it should replace the fields inside the "Replaces" URI header with the ones on the server side.

Example of a received "Refer-To" SIP header:
Refer-To: <sip:240 at 192.168.2.2:5080?Replaces=3a66e96a-61455fdc%40192.168.2.94%3Bfrom-tag%3Df2730c125b735d54o0%3Bto-tag%3Dbk2bk.195.275>



Regards,
Ovidiu Sas

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