This Recommendation defines the Service Change Reasons that are used in the core H.248.1 protocol. It lists the Service Change Reason code associated with the Service Change Reason code name. It provides a definition of when the Service Change Reason is to be used. It also provides an indication of what text may be included in the Service Change extension to allow further interpretation of the Service Change Reason. Clause 5 provides these details.

This revision addresses the following aspects:

Addition of five new Error Codes: 413, 449, 460, 522, 542

Clarifications for Error Codes: 430, 435

Removal of a Package-defined Error Code: 540

Addition of three new Service Change Reasons: 918, 919, 920

NOTE - This Recommendation has been renumbered. It was formerly known as ITU-T Rec. H.248, Annex L.