3Com 3C10402B Administrator's Manual page 485

The ConneXtions gateway has been tested for compatibility with PBX
H.323 gateways that are licensed to use Lucent Elemedia and RADVision
H.323 protocol stacks. It has also been tested with these H.323
telephones:
Siemens HiNet LP 5100 (phone application version 1.1.3)
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ACT Sagitta PH200
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Microsoft NetMeeting (version 3.0)
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IP Addressing
The main goal of an H.323 gateway is to provide telephone-like service
through IP connections. This means each end-to-end connection involves
two types of addresses: a normal telephone number (E.164 address) and
an intermediate IP address. Some H.323 implementations use a
"gatekeeper" to convert the E.164 number into the appropriate
IP address at the calling side, and then to reconvert the IP address to the
E.164 number at the receiving side (for caller ID purposes). ConneXtions
allows you to choose if you want to use a gatekeeper on your network.
Outgoing IP addresses can be entered:
As pre-programmed speed dial numbers that forward callers to the
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Auto Attendant at a remote NBX system.
By modifying the dial plan.
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You can configure the speed dial numbers to include an appended
extension if a person in one NBX system needs to make frequent calls to
someone in another NBX system. Alternatively, you can configure the dial
plan to route these calls seamlessly to the caller.
NBX system calls to outside numbers must use IP addresses or host
names. The ConneXtions software automatically converts host names to
their corresponding IP address.
Voice Ports
Multiple voice ports allow the Auto Attendant to respond to multiple
incoming calls at the same time. However, since these ports are also used
by the voice mail system, voice mail inquiries can slow down incoming
H.323 calls. You might have to increase the number of voice port licenses.
Special Issues 485