3Com SuperStack 3 NBX Administrator's Manual page 439

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 may have to increase the number of voice port licenses.
On the NBX 100 system, 3Com offers 4 license levels:
4 ports, 30 minutes
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4 ports, 4 hours
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6 ports, 20 hours
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12 ports, 80 hours
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On the SuperStack 3 system, 3Com offers 12, 24, 48, 72, and 100-port
licenses. The administrator selects the maximum time for voice mail
storage.
If you choose to increase your existing level of port licenses, you can
purchase additional 1-port incremental licenses.
Extension Dial Plans
PBX systems can use different dial plans. You must consider dial plan
differences when setting up calls between systems. Dial plans differ in
their use of leading digits, number of digits, and excluded numbers. For
more information, see Chapter 2.
Special Issues 439