Subject: [Sipping] Comment on draft-ietf-sipping-cc-transfer-07

From: Siddhartha Bhakta <[email-masked]>
Date: Wed, 15 Nov 2006 17:14:54 +0000 (GMT)

Hi,

The Replace ext/header in sec "7.2.  Protecting
transfer target" of draft-ietf-sipping-cc-transfer-07
is wrong. The to-tag and from-tag should be swapped.

In this example, the Transferee shall interpret the
Replace header. The to-tag and from-tag of Replace
header should be the local-tag and remote-tag
respectively. As far as Transferee is concerned, the
local-tag=7553452 and remote-tag=31431 for dialog1.

Existing
--------
F5 REFER Transferor -> Transfer Target
Refer-To:
sips:[email-masked];grid=3413kj2ha;gruu?Replaces=090459243588173445%3Bto-tag%3D31431%3Bfrom-tag%3D7553452>

F6 INVITE Transfer Target -> Transferee
Replaces:
090459243588173445;to-tag=31431;from-tag=7553452

Corrected
--------
F5 REFER Transferor -> Transfer Target
Refer-To:
sips:[email-masked];grid=3413kj2ha;gruu?Replaces=090459243588173445%3Bto-tag%3D7553452%3Bfrom-tag%3D31431>

F6 INVITE Transfer Target -> Transferee
Replaces:
090459243588173445;to-tag=7553452;from-tag=31431

Thanks and Regards,
Siddhartha

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