I have the problem that my voicemail doesn’t dertect PSTN disconnection. I never have the problem when I answer the call on the extension but when nobody picks up the call and it’s sent to Voicemail it records up to 5 mins (which is the max. length I configured) of PSTN disconnect tone playing most of the time as most people don’t want to talk to Voicemail it seems.
However this also blocks 5 Minutes the PSTN Line and I cannot dial-out anymore during this time. Is there any reason when PSTN detection works properly for picked up calls, but it’s not for VOIP or does it only work for picked-up calls because extension also hangs-up and the end of the call?
The PSTN in my case is a Grandstream HT503 ATA Adapter which can be configured for Current Disconnect AND PSTN disconnec tone. But as the tone is playing I guess PSTN disconnect tone is the correct way to go. Is there any chance I can check I configured is really detect by the Grandstream?
Any help on this would be greatly appreciated