Inbound Dial Plan Overlap and Translation Patterns

[commbubba19]

Hello all. I use this forum frequently but am running into an issue that I can't seem to find a thread on.

My issue is as follows. I have a dial plan of 123-836-[1-8]XXX that encompasses my DID range from my local carrier. I have another DID range of 123-596-7[5-6]XX that I'm adding to my local trunk group from another old system. My company wants to keep these numbers but disconnect the old circuits.

My CUCM gateway is getting 5 digits from my carrier. The old circuits I'm moving were receiving 4 from the carrier, but after the move are sending 5. So now I have an overlap as 123-836-7676 and 123-596-7676 both point to 67676. I hope this makes sense so far.

The conflict is more exaggerated because I have a RP of 67XXX built that routes these digits to a SIP trunk for RightFAX. I have been directed by management for all the old numbers that are being moved to be answered by our receptionist.

So I built a Translation Patter to accept 67XXX and translate it to 64500 (our main reception line). However, this causes all calls that would normally go to RightFax to now go to the receptionist. Obviously this will not work so I undid this change.

The only option I can see at this point is to request my carrier to send me 7 digits instead of 5. However, I'm not sure of the total impact on my current dial plan considering the organization has been based on 5 digits extensions for 5 years now.

Thanks.

 

[loucanick]

If these calls are coming in on different circuits, you could prepend a unique digit(s) on the called number and then use that to route accordingly.

If they are coming in on the same circuit, then there really is no way to know which 67676 was called is there? You would need to get the telco to send you more digits that can be used to differentiate the incoming calls.

 

[commbubba19]

Stupid question but what would be the impact in a big picture of telling the carrier to send me 7 digits instead of just 5? I need to figure out what would be the total impact of such a change.

 

[pndscm]

Have the carrier send you the 7 digits. Create a new Partition (New-PT)and new Gateway CSS (New-GW-CSS). Put the New-PT inside the New-GW-CSS. Create a Translation pattern that changes 836XXXX to 6XXXX and give it a Partition of New-PT and you old Gateway CSS. This will make all your old 5 digit extensions work. Create another new Translation Pattern in the New-PT with the old Gateway CSS that changes 596-7[5-6]XX to 64500 and your receptionist will get all the call from that range of numbers.

Then as you want to use any of the 596-7[5-6]XX, create a more specific Translation Pattern in the same PT/CSS changing the lead digit. So if you wanted 5967511 to be used for someones DID, put 5967511 on the TP translated to 77511.

Another way to do this would be go back to the carrier and have them send you 5 digits that start with something other than 6. The carriers don't have to send you the same digits as was dialed, they can send you anything. But it can get confusing. Then you'd have to diecide if the incoming digits confusion is more than the translated digit confusion.