Recommendation ITU-T H.248.41 defines certain parameters and mechanisms for supporting the interconnection of a packet network with another network. It is only applicable to the IP-based ITU‑T H.248 termination and provides such information as the IP Realm Identifier used to indicate to which packet network the media represented by the termination belongs.

Amendment 1 to the first edition introduced mechanisms that allow the media gateway controller to discover the IP realms that are available at the media gateway at a certain time. It also introduced a length limitation in the IP realm property.

This revision removes the package extension in the IP Realm Availability package in order to resolve a property identity conflict.