[cisco-voip] Dial Plan

[Granger, Simon]

We have had Call Manager 6.1 in place globally.  Clusters are based  Europe, US and Asia.  Our Global design and dial plan was designed in conjunction with Cisco Advanced Services 2 years ago.

Essentially all internal numbers are unique.  They consist of 7 digits.  This comprises 3 digits for an internal site code and 4 digits for site extension which is the last 4 digits of the DDI.  The design encompasses partitioned addressing scheme.  Internal intersite dialling is accomplished via dialling an access code of 8 followed by the 7 digit extension number.  This works via translation pattern of translating 8 to 7 digits where the translation pattern has the access to the partition of the dialled 7 digit extension in another site.  Internal dialing within a site is 4 digits by translation pattern of 4 to 7 digits of the actual real DN.

Our re-seller in the US is stating this is not best practice.  They want to change the dial plan so all DN's are now 8 digits and not 7 beginning with 8.  They want to remove the Translation pattern and give direct access across all DNs.  They state this change will be good for the future.

We in Europe are sceptical of such a change.  We believe this removes a lot of the flexibility of the original dial plan.  Also it cause problems if we want to impose any Class of Restriction.  We have also not seen anywhere that this would be best practice.

If anyone has any thoughts it would be most appreciated.


Thanks



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