Set Caller ID with PHP and ring-out

There is nothing wrong with your code. You said it does not work if you change the caller id number. What happens when it does not work? An error? The caller (from number) does not see the correct caller id, or what?

You can make sure the caller id you are using is valid by calling this endpoint and check if the number has the CallerId feature before using it as a callerId.

$response = $platform->get('/account/~/extension/~/phone-number');

foreach ($response->json()->records as $record){
    print_r ("This phone number ".$record->phoneNumber." has the following features: "."
");
    foreach ($record->features as $feature)
        print_r (" => ".$feature."
");
}

This works,

$fromNumber ="140xxx01";

$CallerIDPhoneNumber ="140xxx01";

the following occurs

1) call is place 2) the php page loads 3) caller Id on recieving call shows the following number: 140xxx01

and this also works

$fromNumber ="140xxx02";

$CallerIDPhoneNumber ="140xxx02";

1) call is place 2) the php page loads 3) caller Id on recieving call shows the following number: 140xxx02

but this does not

$fromNumber ="140xxx01";

$CallerIDPhoneNumber ="140xxx02";

no call is placed and an error occurs resulting in the php page crashing/not loading: