ITU-T H.450.4-2013
Call hold supplementary service for ITU-T H.323 systems (Study Group 16)

Standard No.

ITU-T H.450.4-2013

Release Date

2013

Published By

International Telecommunication Union (ITU)

Latest

ITU-T H.450.4-2013

Replace

ITU-T H.450.4-1999

Scope

This Recommendation specifies the Call Hold supplementary service (SS-HOLD), which is applicable to various basic services supported by ITU-T H.323 Multimedia Endpoints. SS-HOLD enables the Served (Holding) User A to put User B (with whom User A has an active call) into a hold condition (Held User) and subsequently to retrieve that User again.

ITU-T H.450.4-2013 Referenced Document

• ITU-T H.225.0-2009 Call signalling protocols and media stream packetization for packet-based multimedia communication systems (Study Group 16)*， 2024-04-20 Update
• ITU-T H.245-2011 Control protocol for multimedia communication (Study Group 16)
• ITU-T H.323-2009 Packet-based multimedia communications systems (Study Group 16)
• ITU-T H.450.1-2011 Generic functional protocol for the support of supplementary services in ITU-T H.323 systems (Study Group 16)

ITU-T H.450.4-2013 history

• 2013 ITU-T H.450.4-2013 Call hold supplementary service for ITU-T H.323 systems (Study Group 16)
• 1999 ITU-T H.450.4-1999 H.323 Call Waiting Supplementary Services - H Series: Multimedia Infrastructure and Audiovisual Service Systems - Multimedia Supplementary Services Research Group 16.30p