Class Of Service - 3Com NBX 100 Administrator's Manual

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Class of Service

X H.323 G
TIONS ATEWAY
By modifying the dial plan.
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.
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
Extension Delay
Call setup times for digital connections, compared to analog connections,
are instantaneous so there is no need to include a delay between the
IP address and an appended extension.
Incoming H.323 calls to an NBX system usually go directly to the
Automated Attendant. Although the Auto Attendant can respond with
voice instructions, the call does not have to wait until the end of the voice
instruction to respond. The Auto Attendant accepts extensions whether
they are entered manually or as part of a speed dial number.
The use of an H.323 gateway affects the Class of Service assignments
that are applied to extensions because:
H.323 calls use IP addresses instead of the familiar numbers that are
used for public switched network calls (different dial plan).
The cost of an H.323 call is distance-independent, so you do not need
to limit long distance calling for cost reasons.
Chapter 2.