Description
For inbound calls from particular trunk providers, they might signal caller id number with country area code(e.g +39) to PBX, while when try to call back from the phone, providers might not access country area code in callee numbers and then callback fails, therefore we configure the settings in PBX to remove country area code in advance before it is forwarded to sip phones.
Solution
Path: Trunk - Settings - Inbound Caller ID Reformatting.
Configure Patterns with +39X. to match any caller numbers start with +39, X. match the rest digits, DO NOT miss the dot, Strip with 3 means will remove first three characters which indicates +39 will be removed.
How to call back those numbers already with country area code saved on the phone?
The idea is to add one more pattern to match country area code in outbound route, configure Pattern with +39X. and Strip with 3, Pattern will match dialed number start with +39, Strip will remove +39 and then signal call to trunk providers.
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