Answer / Pawan Kumar

H323 supports three types of call flows: a) Call Establishment Call Flow (CECF): This is the standard call flow used for audio calls. b) Gatekeeper Controlled Call Flow (GK-CCF): This call flow is used when there is a gatekeeper involved in the network. c) Multipoint Control Unit (MCU) Controlled Call Flow (MCCF): This call flow is used for conferencing and multimedia communications.

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