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New Member

E164 dialplan Considerations

Hello All,

I'm deploying an E164 dial-plan for the first time. I will use SIP devices on CM 9.1. Phones are 6945 SIP with fw ver: SIP6945.9-3-1-5.

I decided to assign to each phone a directory number in the format \+390212309XXX.

I would also allow users to call each others by dialling 4 digits extensions. I chose 8 as VoIP prefix so each user is internally known as 8[25]XX. I configured a Translation Pattern for 8[25]XX translated to +390212309[25]XX in a dedicated PT accessible to all users.

841XX is my pattern to Unity Connection.

To sum up on the phone I have:

External phone number mask: +390212309XXX

Alerting/display ecc.: "Name 8[25]XX "

I also configured TP in another partition for short-numbers. In this case 83XXX. These short numbers are translated to PSTN numbers (such as: 03481234567 for mobile numbers).

My point is:

- Will I have overlap issues? I think no as far as no extensions in the range 83XX are assigned to directory numbers, right?

- When I dial 8[25]XX (for on-net calls) it seems that I hit inter-digit timeout

-I'm using 6945 SIP phones. Do I fix the interdigit issue using SIP Dial Rules? Something like: 8XXX as pattern

And last questions:

- Can you confirm I'm doing it good?

- Would you recommend using SIP phones?

- Would you do the E164 configuration in a different way? I mean pattern and DN assignment.

Thanks for ur attention


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New Member

E164 dialplan Considerations

Hi Lorenz,

I would assign the DNs a 4 digit number and use the E.164 number as the External Phone Mask (+390212309XXX)

Doing this you dont need to expand the 4 digits to the full E.164 number. However you will need to do this in reverse. E1.64 down to the 4 digit extension for Directory Dialing for example if you had Jabber in the environment or Lync for that fact.


Called number: \+390212309[25]XX

Translated Number: 8XXX

VoiceMail ports: 841XX - This looks ok, I always try to allocate CTI Ports, VM Ports, Call Park numbers etc a non routable number for both the PSTN or Internal range. Otherwise you could hit the inter-digit timeout if one of those patterns or DNs are similar to extensions or PSTN numbers (with your Access Code).

I would look at configuring VM Ports to start with another digit away from '8'. So maybe configure the DN range to be 641XX.

Same with your TPs for mobile numbers. I would look at prefixing their extension with a 5 or something. So if a users extension is 8211 the fast code for their mobile would be 58211.

Let me know if this makes sense.


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