Technical Summary
This document extends STIR and the Authenticated Identity Management
in the Session Initiation Protocol (SIP) error handling procedures to
include the mapping of verification failure reasons to STIR defined
4xx codes so the failure reason of an Identity header field can be
conveyed to the upstream authentication service when local policy
dictates that the call should continue in the presence of a
verification failure. This document also defines procedures that
enable a failure reason to be mapped to a specific Identity header
field for scenarios that use multiple Identity header fields where
some may have errors and others may not and the handling of those
situations is defined.
Working Group Summary
There was general agreement among a fairly small group of STIR participants.
This group included people with SIP and STIR implementation experience.
There was no significant controversy. There were some architectural questions
and some questions about potential privacy leaks that that were worked
through to consensus. One participant questioned whether the mechanism
could be deployed in practice, but most active participants did not see a
problem.
No one has threatened an appeal or expressed extreme discontent.
Document Quality
The shepherd is not aware of existing implementations. However, this work is
likely to be adopted by the ATIS/SIP Forum IP-NNI task force, which will
likely result in wide-spread implementation in the voice service provider
community.
Personnel
Ben Campbell is the document shepherd.
Murray Kucherawy is the responsible Area Director.