Subject: [Sipping] draft-poetzl-sipping-call-completion-01

From: "Huelsemann, Martin" <[email-masked]>
Date: Thu, 24 Aug 2006 11:42:46 +0200

Hi all,

a revised version of the Call Completion draft is available at

http://www.ietf.org/internet-drafts/draft-poetzl-sipping-call-completion-01.txt <http://www.ietf.org/internet-drafts/draft-poetzl-sipping-call-completion-01.txt> .

The intention of the draft is to propose solutions for the requirements for the ETSI TISPAN NGN services Completion of Call to Busy Subscribers and Completion of Call on No reply.

The main change to the previous version is, that there is only one call completion event package now, which can be used for CCBS and CCNR. The indication for CCBS is 'Allow-events: call-completion' in a 486 Busy response, 'Allow-events: call-completion' in a 180 Ringing response is the indication for CCNR.

Then I have added some more explanatory text and signalling flows, I hope that makes the requirements and solutions described in this draft clearer now.

As you renember from the IETF 66 discussion, the main topic of discussion was, is it appropriate to use SUBSCRIBE/NOTIFY, besides subscribing to a call completion event itself, also for managing the call completion queue, for example for suspend and resume procedures.

Questions and comments are very welcome.

Best regards, Martin

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