SPA112 Keeping line open

[itdonkey1969]

I have a device connected to a SPA112 which initiates a call to our operator. When the operator ends the call the device goes silent for a few seconds then gives the off hook howler tone. As there is no handset to this device, the only way to stop this is to reboot the SPA112. I have tried changing the CPC settings but this has not worked. Is there any other way I can get the call to disconnect from both side.

Thanks

[Dan Lukes]

The SPA112 can send "call has ended" signal to it only. It can use CPC or busy tone, for example.

But no way to force your device to go on-hook unless it decide to do it by self.

So read the device vendor documentation or ask vendor for support - you need to know what signal will trigger the on-hook of your device. Then you can ask here how to generate such signal on SPA112 ,,,

[itdonkey1969]

Thanks for the information Dan.  Our vendor has now advised me that the signal to trigger on hook is *#.  How can I generate these tones on call completion?

[Dan Lukes · Accepted solution]

Well, it's a challenge, somewhat. Althougt the "official answer" seems to be - it is not possible, I see a little chance.

You may know that DTMF signals are combination of two frequencies. * is 941Hz + 1209Hz; # is 941Hz + 1477Hz. And tones on SPA112 are configurable.

So try to configure the appropriate tone on SPA112 to sound exactly as DTMF's *# sequence.  Try this:

941@-5,1209@-5,1477@-5; 8(0.5/0.5/1+2,0.5/1/1+3)

If it will works, call me "Great Shaman" ;-)

... and mark the advice as "correct answer"

[itdonkey1969]

Thanks, this is now mostly working.  I have the ATA producing the *# tone rather than the initial off hook tone.  Once this has finished it's run time I do not get the off hook howler.  However I get 3 minutes of silence with a 30 second interval beep.  At the end of the 3 minutes the autodialler calls out to the backup number.  The line fully drops after termination of this second call.
This is not ideal but is accpetable.

Thanks again "Great Shaman"