[cisco-voip] Dial-Plan Advice

[Estes, Timothy]

I have 75 of 300 branches (1500 of 4000 phones) converted on my current project. I'm using 10 digit DNs that are equal to the NPA-NXX-XXXX of the station. If the station does not have a DID I use a 100-YYY-ZZZZ where Y and Z are determined on a calculation based on the voice subnet of the site, making it unique. Dialing within a site is done with 4-10 digit translation patterns. Site to site dialing is caught with 9-1-NPA-NXXX translation patterns that I put in my "global" partition. AAR works, no access codes, no site codes. It has its disadvantages, Unity hates it, plenty of other issues, but nothing I haven't overcome yet.



Timothy Estes
ACS
Ft. Lauderdale FL

________________________________________
From: cisco-voip-bounces at puck.nether.net [cisco-voip-bounces at puck.nether.net] On Behalf Of James Brown [james.m.h.brown at googlemail.com]
Sent: Sunday, November 30, 2008 12:43 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Dial-Plan Advice

All,

Could I ask for some recommendations on designing a firm-wide dialplan
please?

We're looking to roll out Cisco IPT to potentially 100 branches (ranging
5 - 1000 handsets) over the next few years. Where possible, branches
will have a regional cluster, with SRST configured at the local site.

The goal is to have a dialplan which permits users at each site to call
other sites over the MPLS WAN, reverting to AAR when necessary and using
TPs under SRST to expand the short dial number into PSTN format.

Cisco have recommended using:

* 7 digit DNs with TPs to permit 4-digit local calling
* Global dialplan 8 XXX YYYY. X=Site DDI Digit, Y=Extension

I think this is good, but on our scale we're bound to get conflicts if
we only use three digits from the DDI.

My preference is to instead allocate a random three digit unique number
to each site that is unrelated to the DDI. Could anyone explain what
disadvantages having a short dial that is unrelated to DDI could have
please? Is AAR still configurable? Are there any other dial-plan models
that you would recommend?

Many thanks for your time.

Regards

James.

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