Issue 2.0
7-2 H.323 Trunking
SECTION 2 H.323 TRUNK IMPLEMENTATION
The UNIVERGE SV9100 implementation and programming for SIP and H.323 are
very similar. The call routing, call features and speech handling (RTP) are the same –
only the signaling protocol is different. For this reason, the description and examples
below can be used for either implementation (the differences are clearly defined). IP
Trunk is used to describe SIP or H.323 trunks.
The information below relates to basic networking, without the use of external H.323
Gatekeeper. The following steps are required to configure IP Trunks:
2.1 Determine Numbering Plan
When planning the IP Trunk implementation, it is important to determine the
numbering plan for the sites. A properly planned VoIP network allows flexibility
and simplifies additions or changes to the network.
There are two approaches to the numbering scheme;
Open Numbering
In this case the sites are identified by dialing codes that are appended to
the dialed digits. This allows the extension numbers to be the same at
multiple sites.
Example:
Extension 200 at System A can dial Extension 200 at System B by dialing
the extension 2200.
This numbering scheme is ideal when there are a large number of sites in
the VoIP network or when many extension numbers are in use at each site.
Closed Numbering
In this case, the first digit of the extension number is used for routing calls.
This alleviates the need for dialing a site code and makes a more unified
numbering plan. This is feasible only if there is a relatively small number of
sites or the sites have very few extensions.
System A System B
Extension Number
200-299 200-299
Site Code 1 2
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