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Viking CPC-1 Call fixes the problem
Are you using VOIP to analog and your call doesn't end when you hang up the phone? I was expereincing this. On my answering machine I would have 35 seconds of dial tone after someone hung up. This device will terminate the call when it detects dial tone after a hang up. Works great!
The CPC-1 will generate a CPC disconnect signal on a PABX analog station (or any other line that does not provide this signal). A CPC (Calling Party Control) signal is a momentary break in phone line loop current, which is used to signal automated telco equipment (ie. voice mail, call sequencers, etc.) the distant party has hung up. Central Office telephone lines typically provide this signal, but Analog PABX stations do not. The CPC-1 will generate a 1 second disconnect when it detects a busy signal, reorder tones (fast busy), return to dial tone, or silence.