Asterisk Variable Manipulation: Substrings, Math and Caller ID Rewriting
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Most real dialplan work is string surgery. Strip a prefix, add a country code, extract a DID from a header, normalise a caller ID. Asterisk's variable syntax handles all of it, but the substring notat
VICIdial Dialplan Entry Explained: Pattern Matching, Priorities and Carrier Routing
You have added a carrier in VICIdial, the SIP trunk shows `Registered`, and the campaign still will not dial. Nine times out of ten the problem is in the **Dialplan Entry** field, not the trunk. This