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400 APPENDIX D: CONNEXTIONS H.323 GATEWAY
(G.711 and G.723), H.323 gateways negotiate the type of compression
they use during each call setup. Negotiation ensures that the compression
on the transmit side matches the decompression processing on the
receiving side. With the frame and packet overhead, each G.723 channel
needs about 19.2 Kbps of the available bandwidth.
Standard Extensions ConneXtions routes incoming H.323 calls to one designated extension,
usually the Auto Attendant. Callers can dial additional digits to redirect
calls to internal extensions, but cannot access outside lines by dialing 9.
Remote Internet
Device Connections
A NBX system with a ConneXtions gateway can communicate with
remote H.323 devices other than NBX Business and Basic Telephones,
such as:
■ Wireless handsets
■ Personal computers
■ Ordinary telephones (POTS) with adapters
■ H.323 gatekeepers
Wireless Handsets
An emerging class of H.323 wireless handsets is being used by some
large outlet stores as portable PBX telephones. A ConneXtions H.323
server is well suited for use with these H.323 handsets.
Personal Computers
Microsoft NetMeeting software supports H.323 voice connections over
the Internet. The personal computer must be equipped with Internet
access, a sound system, and a microphone.
The current version of Microsoft NetMeeting (3.01) cannot conveniently
place calls through the Auto Attendant because it has no way of entering
extension digits after it reaches an IP address (the Auto Attendant). This is
a temporary limitation that usually disappears when those programs
upgrade to H.323 version 2. Version 2 requires that compliant devices
support out-of-band DTMF (touch-tone) signaling.
If you choose ConneXtions as the gateway under the Advanced Calling
options, and if you configure NetMeeting to “speed-dial” the IP address
and extension, Microsoft NetMeeting can place calls to an extension.