Nortel VoIP Gateway, Configuration Manual, Page: 19 / 220

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Norstar VoIP Gateway Configuration Guide
• Emergency Line, connected to the unused pins on port #4, with a relay to an analog line, even
if the VoIP Gateway is powered off.
• LEDs on the front and rear panels that provide information on the operating status of the VoIP
Gateway and the network interface
• Restart button on the front panel that restarts the VoIP Gateway
• compact, rugged enclosure only one-half of a 19-inch rack unit, 1 U high (1.75" or 44.5 mm)
• mounting option of installing two VoIP Gateway in a single 19-inch rack shelf, one U high
(1.75" or 44.5 mm).
Supported H.323 features
The VoIP Gateway implements the RadVision™ H.323 version 4.0 protocol stack. In this version,
the VoIP Gateway features the following:
Gatekeeper
• Works without a Gatekeeper using the internal phone table.
• Registers to a known Gatekeeper.
• Supports Gatekeeper registration with prefixes
• Functions as an H.323 gateway or can imitate an H.323 terminal with up to four aliases.
• Uses routed-mode calls.
• Uses direct-mode calls.
• Uses redundant Gatekeepers if a redundant Gatekeeper is defined.
• Can fallback to internal routing table if there is no communication with the Gatekeeper.
• Supports the "TimeToLive" parameter. The VoIP Gateway sends Registration requests up to
"TimeToLive" expiration.
• Supports IRR messages for KeepAlive.
• Supports the mapping of destination (Alias) numbers in the ACF message by the Gatekeeper.
• Supports RAI (Resource Available Indication) messages, informing gatekeeper that the
gateway resources are below a threshold.
Call setup
• Can use the Normal Connect procedure.
• Can use the Fast Connect procedure with or without immediately opening a H.245 channel.
• Can use Tunneling.
• Can negotiate a codec from a list of given codecs for Normal or Fast Connect procedures.
• Can open a H.245 channel when using Fast Connect.