Configuration manual

Dial plan considerations
A uniform dial plan greatly simplifies configuration, management and phone calls within the
network branch sites. For example, if each branch has similar roles such as reception, manager
and warehouse - using the same extension number for each role and a unique prefix for each
branch allows calls between sites with little need for directory lookups. It also means a standard
configuration can be used at branches; simplifying installation, user training and
maintenance.
For our examples we have used the following dial plan for each branch site:
• 3-digit branch prefixes beginning with 8 — A 3-digit branch prefix in the range 800 to
899. This allows us up to 100 branches yet keeps call routing simple. Any dialing at a
branch that being with an 8 can be assumed to be a call to a branch number and can be
routed to the Avaya Aura
®
Session Manager for routing to the correct branch.
• 3-digit extension numbers beginning with 2 — 3-digit extension numbers for all native
extensions and hunt groups starting from 200. This is the default numbering used by
B5800 Branch Gateway.
Dial plan example
To describe a dial plan example, we have created Acme Travel, a travel agency with a growing
number of branches. Each branch follows the same pattern, with extensions for a branch
manager and a small team of travel consultants in a sales group.
Given the nature of the business, branch users need to make national and international calls.
The company has taken advantage of a bulk call contracts from it headquarters site so wants
such calls routed via the headquarters site wherever possible. In addition, the branch staff want
to keep their branch phone numbers.
• 3-digit branch numbers beginning with 8, ie. 800 to 899.
• 3-digit native extension numbers beginning with 2, ie. 200 to 299.
• Dial 9 prefix for outgoing PSTN calls.
• National and international calls allowed but routed via the headquarters site's PSTN
trunks.
• Where a national call matches a branch location, it should be routed to the PSTN via that
branch.
• Local calls allowed from each branch using its own PSTN trunks.
Planning
36 Implementing the Avaya B5800 Branch Gateway for an Avaya Aura
®
Configuration October 2012
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