Welltech ePBX80 V.1.1 - Manual (Page 32)

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exact Frequency, Cadence ON/OFF time and you need to fill in tone table for FXO Line port
to detect exact disconnect tone in order to release FXO port after call. Please see Section
5.4 in details.
Figure 3.1.3-1 Disconnect tone Recording Procedures
Disconnect Tone Recording Steps.
Step 1
: Go to ePBX80 webpage at Configuration  IP PBX to set up voice codec priority
at G.711U.
Step 2 : Go to Webpage at Telephony  Tone  Disconnect Tone Recording 
General Setting  PSTN Line No to enter remote PSTN side phone number which is
busy in talking state. In this example at above Figure 3.1.3-1, the PSTN number is
82263290 and FXO Line port is 7. Next, press Apply and go to Management command to
do Soft Reset.
Step 3 : Use one IP Phone or IP devices which was registered ePBX80 and dial the PSTN
number you have entered at Step 2 (the number is 82263290, for example). And this call
will use FXO port 7 to dial out to local PSTN network.
Step 4 : Because this PSTN number is in busy status (at Step 2’s configuration), you will
hear Disconnect Tone (for example, Du… Du.. Du..) after dialing. Keep hearing this
disconnect tone for 5 seconds. Then hang up this call.
Step 5 : Go to webpage at Telephony  Tone  Disconnect Tone Recording as
following command to Export Tone file if this disconnect tone recording is successful.