Need help with PSTN disconnect issue on SPA-3102-GW ATA.
[I have the latest FW release, 5.2.13 for this unit.]
ATA is configured as PSTN-VoiP gateway. Line1 is registerred to remote PBX, PSTN is registerred to same PBX but different number.
PSTN calls are setup to divert to PBX extension after 20 sec's.
Incomming PSTN call, Line1 phone rings (ok so far), 20 secs expires call diverts to PBX extension and call is placed - everything ok.
Either caller or callee hangs up and call is terminated.
Incomming PSTN call, Line1 phone rings - now sometimes caller hang-up just before the 20 secs divert time.
When this occurs, the phone on Line1 rings a litle longer, then diverts to PBX extension. Issue now is, PBX extension answers but caller has hung-up and PSTN line remains off hook for ever until PSTN line is physically removed from socket OR unit is power cycled.
Disconect tone works fine for 'pure PSTN' calls, incomming / outgoing. The problem exists once the call gets diverted from PSTN to VoiP - through the setting 'VoiP answer delay' setting.
If the PSTN caller hangs-up just before the "VoIP Answer Delay" threshold, the call will ring one to two times more, invoking 'VoiP Answer Delay", therfore turning the call into a VoiP call - it's at this point that the unit wont detect PSTN disconnect.
I'm looking at why the unit does this, is it a bug or by design?
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