Beep tone can be generated by software but for analog telephone lines only. It is not possible to generate beep onto digital lines such as T1/PRI/ISDN, digital PBX phones, or VoIP phones. The alternative is to use the handset beep adapters which connects to the telephone handset coil cord because that is an analog connection. Most PBX or phone systems do not have this beep feature either. But it does have an auto-attendant feature which makes an announcement that inbound callers can hear i.e. “Your calls are recorded for training purposes…” This auto-attendant is only for inbound calls and not outbound calls. So one way is to have the call recorder setup to only record inbound calls connecting to your trunk lines.