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

It is subdivided into

  • H.450.1 Generic functional protocol for the support of supplementary services in H.323.
  • H.450.2 Call Transfer supplementary service for H.323.
  • H.450.3 Call diversion supplementary service for H.323.
  • H.450.4 Call Hold supplementary service.
  • H.450.5 Call Park supplementary service.
  • H.450.6 Call Waiting supplementary service.
  • H.450.7 Message Waiting Indication supplementary service.
  • H.450.8 Calling Party Name Presentation supplementary service.
  • H.450.9 Completion of Calls to Busy Subscribers supplementary service.
  • H.450.10 Call Offer supplementary service.
  • H.450.11 Call Intrusion supplementary service.
  • H.450.12 ANF-CMN supplementary service.

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.

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