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Is there a Q931 SIP interworking document?

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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

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This was first published in June 2004

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