Avaya Nortel Communication Server 1000 Manual page 40

40 Description
Gateway functional description
The Gateway performs the following functions:
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Gateway functionality on the CS 1000 systems
A Signaling Server is always present in the CS 1000 systems. The LTPS
executes on the Signaling Server, and the Voice Gateway executes on the
Voice Gateway Media Cards and DSP daughterboards. The Voice Gateway
Media Cards only provide the voice gateway access.
Active Master
The LTPS maintains a count of the number of IP Phones registered to the
card. Each IP Telephony node has one active Master. The active Master
broadcasts to all LTPS and requests a response if it has room for another IP
Phone.
IP Phone registration
This section describes the maximum number of IP Phones that can register
to an LTPS in a CS 1000 system.
IP Phone registration on a CS 1000 system
On a CS 1000 system, the IP Phones register with the LTPS on the Signaling
Server. If more than one Signaling Server exists, the IP Phone registrations
are distributed equally among the Signaling Servers to aid in load balancing.
If the primary Signaling Server fails, a secondary Signaling Server takes
over (if it exists), and the IP Phones that are registered with the failed
Signaling Server re-register with the LTPS on secondary Signaling Server.
If no other Signaling Servers exist or if the Signaling Servers fail, the IP
Phones register with the LTPS on the Voice Gateway Media Cards.
Each Signaling Server supports the registration of up to 5000 IP Phones.
Copyright © 2003–2008, Nortel Networks
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registers with the system using the TN Registration messages
accepts commands from the system to connect or disconnect the audio
channel
uses Real-time Transport Protocol (RTP) and Real-time Control Protocol
(RTCP) to transport audio between the gateway and the IP Phone or
another gateway
encodes and decodes audio from PCM to and from the IP Phone format
provides echo cancellation for the speaker on IP Phones for echoes that
originate in the circuit-switched voice network (not applicable to the IP
Softphone 2050 or MVC 2050, as they have no handsfree capability)
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
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