Our office uses a RingCentral phone system, we forward to an outside answering service at night. The forwarding works, but the caller ID is messed in a specific way by RingCentral. For instance, if a caller with the phone number 312-456-7890 calls our office after hours - the call will get forwarded to our answering service, but our answering service will see the call as coming from 567-890-0000. So the first 4 digits of the original caller ID are removed and four trailing 0's are added. This is a major problem for us and if it can't be fixed we'll have to find another vendor.