scope:

Recommendation ITU-T H.248.80 describes the interworking of the SDP described by the "Revised SDP Offer/Answer (O/A) model" with ITU-T H.248. The "Revised SDP Offer/Answer model" is characterized by the following documents:

- SDP capability negotiation (SDPCapNeg) defined in [IETF RFC 5939]

- SDP media capabilities negotiation (MediaCapNeg) defined in [IETF RFC 6871]

NOTE - The support of miscellaneous capabilities negotiation in the Session Description document - [b-IETF RFC 7006] and Extension for PSTN bearers [b-IETF SDPCS] is for further study.

This Recommendation describes the relationship between the ITU-T H.248 group concept and the revised SDP offer/answer model concepts of actual and potential configurations. It provides guidelines for the inter-working between SDPCapNeg and normal ITU-T H.248.1 procedures. Rather than focussing on the SDPCapNeg procedures in the context of session handling, this Recommendation concentrates on mapping the between ITU-T H.248.1 and the SDP Capability negotiation framework SDP syntax. For interactions between the functions of SDPCapNeg and different SDP attributes, see [IETF RFC 5939] and associated IETF documents.

This Recommendation also discusses the support of [IETF RFC 6871] by ITU-T H.248.

In order to address several deficiencies in interworking between SDPCapNeg and [IETF RFC 6871] and ITU-T H.248 this Recommendation defines two packages that allow a more optimized support of the revised SDP offer/answer procedures on MGCs that also support ITU-T H.248.