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Is there a Q931 SIP interworking document?

Is there a Q931 SIP interworking document?
I haven't seen anything specific on Q.931 and SIP interworking. There has been more activity on the SS7 and SIP interworking.
http://www.cs.columbia.edu/sip/drafts_pstn.html

There are some call flow diagrams scattered about. The following expired draft has a successful SIP to ISDN PBX call in section 2.2:
http://www.iptel.org/info/players/ietf/callflows/draft-ietf-sipping-pstn-call-flows-02.txt

This was last published in June 2004

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