H

H.225

Protocols (RAS, RTP/RTCP, Q.931 call signaling) and message formats for H.323.

H.245

A protocol for capability negotiation, messages for opening and closing channels for media streams, etc. (i.e. media signaling).

H.323

An ITU-T "umbrella" of standards for Packet-based multimedia communications systems. This standard defines the different multimedia entities that make up a multimedia system - Endpoints, Gateways, Multipoint Conferencing Units (MCUs), and Gatekeepers -- and their interaction. This standard is used for many Voice-over-IP applications, and is heavily dependent on other standards, mainly H.225 and H.245.

Hairpin

Telephony term that means to send a call back in the direction that it came from. For example, if a call cannot be routed over IP to a gateway that is closer to the target telephone, the call typically is sent back out the local zone, back the way from which it came.

Hop off

Point at which a call transitions from H.323 to non-H.323, typically at a gateway.

Business VoIP

VoIP

for Business

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