Interworking ISDN Call Control User Information with SIP
This RFC 7434 was published in 2015
The motivation and use cases for interworking and transporting User- to-User Information (UUI) from the ITU-T Digital Subscriber Signalling System No.
1 (DSS1) User-user information element within SIP are described in RFC 6567.
As networks move to SIP, it is important that applications requiring this data can continue to function in SIP networks as well as have the ability to interwork with this ISDN service for end-to-end transparency.
This document defines a usage (a new package called the ISDN UUI package) of the User-to-User header field to enable interworking with this ISDN service.
RFC 7434 introduction
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