H.450 is an umbrella protocol to support supplementary services in H.323.

It is subdivided into

<ul><li>H.450.1 Generic functional protocol for the support of supplementary services in H.323.</li><li>H.450.2 Call Transfer supplementary service for H.323.</li><li>H.450.3 Call diversion supplementary service for H.323.</li><li>H.450.4 Call Hold supplementary service.</li><li>H.450.5 Call Park supplementary service. </li><li>H.450.6 Call Waiting supplementary service.</li><li>H.450.7 Message Waiting Indication supplementary service.</li><li>H.450.8 Calling Party Name Presentation supplementary service.</li><li>H.450.9 Completion of Calls to Busy Subscribers supplementary service.</li><li>H.450.10 Call Offer supplementary service.</li><li>H.450.11 Call Intrusion supplementary service.</li><li>H.450.12 ANF-CMN supplementary service.</li></ul><p> </p><p> </p><p>In Cisco CME it is important to remember to enable H.450.12 in addition to the default subprotocols for redirection of calls to work. </p><p> </p><p> </p><p> </p>