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E.164 caller ID format for outgoing calls

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Hi there, 

I have a SIP trunk (offnet) configured for outbound calls.

I want to configure it in a way, when I have local outbound calls (Belgium) to send local DID (0123456789) and when the call is an international one, I want it to send e.164 format +32123456789

For information, Belgian DID are:

9 digits for Fixed DID  (including zero)
10 digits for Mobile DID (including zero)

I configured the offnet as following:

   "formatters": {
       "request": [
               "regex": "^(\\d{9,10})$",
               "prefix": ""
       "caller_id_number": [
               "regex": "^(\\d{9,10})$",
               "prefix": "+32"

But when I make a call, the caller ID sent is always local one 0123456789 rather than sending +32123456789.

I guess, I'm missing another settings but couldn't find where and which one.
Can you please advise what should be set for sending e.164 format when making international call?



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