Protocol

H.245

Lab ready Full lab

H.323 multimedia control protocol for capability exchange, master/slave determination, and logical channel open/close. Fast Start and H.245 tunneling inside H.225 reduce setup round trips. Modern deployments often prefer SIP/SDP but H.245 remains in legacy video networks.

Domains

telephony

Layers

Tags

h323capabilitieslogical-channelscontrol

Sources

ITU-T H.245

Related protocols

H.323

ITU umbrella for packet multimedia: H.225.0 call signaling/RAS, H.245 media control, and RTP/RTCP media. Gatekeepers provide admission an…

H.225.0

H.323 call signaling and RAS: Q.931-derived Setup/Alerting/Connect on the Call Signaling Channel plus gatekeeper discovery/registration. …

SDP

Textual session description: media lines, codecs (rtpmap/fmtp), ICE candidates, and direction attributes. Carried in SIP, WebRTC, and MGC…

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RTP

End-to-end media transport for audio/video: sequence numbers, timestamps, SSRC, and payload type. Usually over UDP; profile and format sp…

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