Protocol
H.323
ITU umbrella for packet multimedia: H.225.0 call signaling/RAS, H.245 media control, and RTP/RTCP media. Gatekeepers provide admission and address resolution; still common in enterprise video.
Domains
Layers
Tags
voipgatekeeperrascall-signaling
Sources
- ITU-T H.323
- ITU-T H.225.0 / H.245
Related protocols
H.225.0
Lab readyH.323 call signaling and RAS: Q.931-derived Setup/Alerting/Connect on the Call Signaling Channel plus gatekeeper discovery/registration. …
H.245
Lab readyH.323 multimedia control protocol for capability exchange, master/slave determination, and logical channel open/close. Fast Start and H.2…
SIP
Lab readyText-based signaling for creating and managing sessions. Methods (INVITE, ACK, BYE, REGISTER…) and response codes resemble HTTP; SDP bodi…
SDP
Lab readyTextual session description: media lines, codecs (rtpmap/fmtp), ICE candidates, and direction attributes. Carried in SIP, WebRTC, and MGC…
RTP
Lab readyEnd-to-end media transport for audio/video: sequence numbers, timestamps, SSRC, and payload type. Usually over UDP; profile and format sp…
Q.931
Lab readyISDN user-network call control: SETUP, CALL PROCEEDING, ALERTING, CONNECT, DISCONNECT, RELEASE. Information elements carry bearer capabil…