Avaya Business Communications Manager 5.0 - Planning and Engineering User Manual Page 188

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188 VoIP trunk gateways
Nortel Business Communications Manager 5.0
Planning and Engineering
NN40170-200 01.03 Standard
August 2009
Copyright © 2009 Nortel Networks
The H323 and SIP Media Parameters tabs determine a number of system
settings. These values need to be coordinated with the other systems on the
network to ensure that all features work consistently across the network.
Media parameters include setting:
the order of preferred codecs
voice activity detection
jitter buffer size
codec payload size
IP fax transmission availability on the network
The local gateway parameters define how the BCM prefers call signaling
information to be directed through VoIP trunks. Call signaling establishes and
disconnects a call.
If the network has a gatekeeper (H.323 trunks only), the BCM can request a
method for call signaling, but whether this request is granted depends on the
configuration of the gatekeeper. Ultimately, the gatekeeper decides which call
signaling method to use.
Local gateway settings include
fallback to circuit switched availability and scope
type of call signaling, either directly to the far end system or through a
network gatekeeper
if there is a gatekeeper, the relevant IP information is noted
a KeepAlive signal timer
the protocol the system uses for the gateway (must be compatible with
remote system or gatekeeper)
allowing/disallowing VoIP gateway tunnel H.245 messages within H.225
being able to identify unique call signaling and RAS ports
Notes about NPI-TON aliases for H.323 trunks
NPI-TON aliases store dialed number prefixes as well as information about
the type of number. A dialed number can be qualified according to its TON
(type of number), as well as its NPI (numbering plan identification). Nortel
recommends this format over the E.164 format, for encoding dialed numbers
and aliases registered with a gatekeeper.
When using a gatekeeper, and attempting to place an outgoing VoIP trunk
call, ensure that the route and dialing plan configuration matches the NPI-
TON aliases registered, by the destination, with the gatekeeper. These
requirements are summarized in the following table.
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