DID translation best point

Unanswered Question
Jun 5th, 2008


I have a general question about DID best practise.

In the scheme "CUCM <ip> ROUTER <t1/e1> TELCO PBX <cloud> PSNT subscriber"

where is the best practise to perform a DID translation (while incoming

call from PSTN subscriber is receiving):

- on the router under voip/pots dial-peers through translation profiles/rules ?


- on the cucm itself by matching the whole DID number into route pattern ?

By the way is it possible at all to match incoming DID number into CUCM's route/

translation pattern or they are only designated for outbound (from CM Cluster) calls only ?



- DN no: 200 - 209

- DID no: 5551-23x (coming from PBX, only the last 3 (three) digits are significant)

*** router

dial-peer 2 pots

incoming-called number 555123.

forward-digits 3


dial-peer 1 voip

destination-pattern 23.

session target ipv4: <cucm_ip>

translation-profile outgoing PSTN-CUCM


voice translation-rule 200

rule 1 /^23/ /20/


voice translation-profile PSTN-CUCM

translate called 200



*** cucm

a. create route/translation pattern 555123X

b. do the neccessary called number translation based on transformation fields

Thank you very much.

I have this problem too.
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Tobivan_Helden_2 Fri, 06/06/2008 - 21:56


Is my question silly enough ? Or to hard ?

Can anybody share their opinion or correct me if something ?


Justin Brenton Sat, 06/07/2008 - 12:56

Hi Tobivan,

You have to create the dial peers on the router and then forwarded to CUCM. CUCM will then do whatever you want with it depending on how you configure the DID. As you know there are many functions to a DID number.

This is just the way it works, the router has to know what to do with the calls.

Hope this helps,

Please rate,




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