The "SIP-Supported-User-Data-Type" AVP

The "SIP-Supported-User-Data-Type" Diameter AVP, which is of type UTF8String, uses the AVP code "388".

It has the MANDATORY flag.

It is part of the Server-Assignment-Request, Server-Assignment-Answer commands.

It is part of the Diameter Session Initiation Protocol (SIP) Application application.

It is defined in the Diameter Session Initiation Protocol (SIP) Application specification.