Interworking ISDN Call Control User Information with SIP

The information below is for an old version of the document
Document Type Expired Internet-Draft (cuss WG)
Last updated 2012-11-05 (latest revision 2012-05-04)
Replaces draft-drage-cuss-sip-uui-isdn
Stream IETF
Intended RFC status (None)
Expired & archived
pdf htmlized bibtex
Additional URLs
- Mailing list discussion
Stream WG state In WG Last Call
Document shepherd None
IESG IESG state Expired
Consensus Boilerplate Unknown
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The motivation and use cases for interworking and transporting ITU-T DSS1 User-user information element data in SIP are described in the "Problem Statement and Requirements for Transporting User to User Call Control Information in SIP" document. As networks move to SIP it is important that applications requiring this data can continue to function in SIP networks as well as the ability to interwork with this ISDN service for end-to- end transparency. This document defines a usage (a new package) of the User-to-User header field to enable interworking with this ISDN service. This document covers the interworking with both public ISDN and private ISDN capabilities, so the potential interworking with QSIG will also be addressed. The package is identified by a new value "isdn-uui" of the "purpose" header field parameter.


Keith Drage (
Alan Johnston (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)