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SERVICES AND TOPOLOGIESCALL SERVER : VOICE ON IP
Ed. 04 1/12Réf. 3EH 21000 BSAA
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SERVICES AND TOPOLOGIES
SERVICES
Alcatel OmniPCX Office provides 2 services that can be combined:
- Voice over IP is based on the Integrated H.323 Gateway, the core of Voice over IP (VoIP), which
allows communication between the conventional telephony world and the data world.
- IP telephony enables an enterprise to share its data infrastructure (local IP network) between the
data world and the telephone world by means of an adapter known as an "IP Enabler" which con-
nects up an Alcatel Reflexes station on the LAN and/or a Windows application on a Multimedia PC
(PIMphony IP Edition) to simulate a LAN PC station. The level of service offered by the IP Enabler is
identical to that of standard Reflexes stations.
The Voice over IP services are provided by one or more CoCPU (CoProcessing Unit) VoIP boards (max.
6). This board integrates an H.323 gateway which has the following main characteristics:
- from 4 to 96 DSP channels for the H.323 gateway and IP Telephony services (DSP channels for
coding / decoding the audio signal).
- supports the audio compression algorithms G711, G729a and G723.1.
- IP communications in Full Duplex mode.
- a V2-compatible H.323 gateway that complies with the following recommendations:
• supports Q.931/Q932 signaling.
• supports the H.225 v2 protocol for establishing signaling channels between H.323 gateways
(including Fast Connect).
• use of the H.245 v4 protocol to monitor communications: establishing channels, negotiating
the Codec, etc.
- RAS signaling for communications with the H.323 internal gatekeeper (H.323 v2) to the product
or to the outside (authentication, authorization, bandwidth management).
- use of RTP/RTCP to send audio signals in real time.
- echo suppression.
- silence suppression (VAD).
The gateway also integrates an H.323 v2 gatekeeper that provides the following functions:
- RAS (Registration Admission Status) server.
- protection and authentication of recording sequences (H.235).
- testing the presence of remote H.323 gateways (ICMP or H.323 packets).
Nota : All communications and VoIP signals transit through the VoIP CoCPU board, except in the
case of PC to PC or terminal to terminal communications.
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