[Asterisk-Users] Prefix to CALLING Number ?

[barney]

Hi there,

I`m trying to add some prefix before my local extensions, when my calls are routed to ZAP trunk.

(i.e.:  my local extension is 3333, and i would like to send request to my telco provider with source phone number 5555553333)

Is there any way to do this ? I just know to add prefix (via prefix application) to the called number (but not calling).

Thanks,

barney

PS:  sorry for my poor english
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