H.323 Basic Call Setup
The breeze action after a attendant includes these steps:
1. The basic aperture initiates an H.225.0 affair with the destination aperture on
registered TCP anchorage 1720. The aperture determines the IP abode of the destination
gateway internally. The aperture has the IP abode of the destination endpoint in its
configuration, or it knows a Area Name System (DNS) resolvable area name
for the destination.
2. Call bureaucracy procedures based on Q.931 actualize a call-signaling approach amid the
endpoints.
3. The endpoints accessible addition approach for the H.245 ascendancy function. The H.245 control
function negotiates capabilities and exchanges analytic approach descriptions.
4. The analytic approach descriptions accessible RTP sessions.
5. The endpoints barter multimedia over the RTP sessions, including exchanging call
quality statistics application RTP Ascendancy Protocol (RTCP).