Hello, I have a problem with a 3cx phone system. I have set an IVR and one of the options is "transfer to extension". This extension has as default setting to forward calls to a external number. I have set the out-rule in the right way but when I call the number and ask to be transferred to "101" the internal number that should transfer the call, it says " Call transfer failed" and IVR playes again, same thing from the voicemail. Without 3cx Ican do external calls so it's not a provider matter. What should I do?