FreePBX 16.0.26
I have configured an extension, an inbound route, an outbound route and a trunk in order to forward to a PSTN number the incoming calls to a DID number.
In the extension I have set the PSTN number to which calls are forwarded in the follow-me list.
In the outbound trunk I have written the SIP credentials of the VOIP provider that gives me access to the PSTN. I have used a Dellmont provider.
This works; however the problem is that the Dellmont provider allows forwarding the caller id only if it is one of the CID’s that are registered in the Dellmont account. If the caller id is not in the authorized list, the call is received as anonymous by the PSTN phone.
This is line of principle is normal, because the Dellmont providers wants to avoid spoofing the caller id. But thus it is not possible to forward the CID in the forwarded calls, when using such providers in the outbound trunks.
Which VOIP providers exist, which can be used to forward any caller id in the PSTN forwarding in the outbound trunks of freepbx?