Internetwork Dialing - RADVision L2W-323 User Manual

Using the L2W-323 Gateway

Internetwork Dialing

The L2W-323 Gateway enables H.323 endpoints on an IP-based LAN to communicate with
H.323 endpoints on other IP-based LANs and H.320 terminals or telephones on the ISDN,
PSTN or cellular networks.
The Internetwork examples describe:
!" How to set up the Gateway to support LAN-to-WAN and WAN-to-LAN dialing.
!" Dialing steps you have to take to place different LAN-to-WAN and WAN-to-LAN
calls.
Dialing Out to the WAN through the Gateway
H.323 LAN endpoints (terminals and IP phones) can place calls to H.323 endpoints on other
LANs and terminals or phones on circuit switched public networks via Gateway services.
The service dialed by the LAN endpoint determines the type (voice/video/data) and
bandwidth of the call.
Network Administrator Actions
!" Define Services – services are identified by service prefixes. The network
administrator in charge of the H.323 network is responsible for defining services and
informing users of the service available. The following table lists services and prefixes
that are used in the dialing examples in this chapter.
Service
Voice call
Video call
V.35 384 Kbps
video call
The services listed have to be defined for the Gateway and the default Gatekeeper.
Endpoint phone numbers should not begin with the same numeric string as the
services.
For information on defining services, see "Defining Gatekeeper Services" and "Setting
Gateway Services" in Chapter 5, "Basic Configuration."
7-2
Prefix Description
9 For voice only calls over one B channel.
82 For videoconferencing calls using 1B or 2B
channels.
86 For high bandwidth videoconferencing calls over
V.35 ports.