Call Forwarding - Preserve Caller Number

[jens.hartmann]

How can we preserve the caller number on Forwarding? We always the the main number on the destination phone so we can't see the original number.

 

[YiannisH_3CX]

Hello @jens.hartmann

Please note that the first thing you need to verify is if your provider actually supports this function as many providers do not allow you to forward a call with a caller ID that does not belong to you.
If this is supported you need to know SIP field the provider is using to read the caller ID. Once you have this info you can navigate to your trunk settings / Outbound parameters and adjust the specific SIP field to "OriginatorCallerID"