More On Detecting Caller Hang Up

[Guest IVR_Newbie]

I followed the thread suggested in the Knowledge Base, and also all other relevant threads I could locate from the forum, but unfortunately still could not get my d/4pciu to detect caller hangup.

 

I used the 'call and unplug phone line' method to infer that the loop current drop method is used by telco (since VG immediately detected end of call). My puzzle is then ... what's next? ... because the scripts still could not detect end of call.

 

I'll also used the dtmf 'on {d} then hangup' method but still did not get it to work.

 

By the way, is the loop current drop method of detection has made some assumption on network, so does it mean that some call ends may be detected, while some others may not?

 

Excuse me for still asking for help even there is a detailed thread on this already.

 

Thanks for your help!

[Guest IVR_Newbie]

Forgot to add ... when I used another phone to call to the line and pick up by phone, to me I can hear the busy tone instantly without the 'click' sound and without the need to get wait for the busy tone to come on.

 

Does that mean the line is not giving any tones to signify caller hang up?

[Guest IVR_Newbie]

I'm glad to tell you that the problem is solved!

 

It actually told some more times to study the suggested thread

 

http://voiceguide.com/forums/index.php?showtopic=599

 

more carefully before a newbie like myself got to figure out the resolution. Hence, I would like to share this with some other newbies like myself. Here is my path to resolution (excluding all other hours of trial-and error attempts!):

 

1. Confirm loop current drop detection on my dialogic d/4pciu by calling in and unpluggin the line (confirm by seeing vg indicates a disconnect within 2 seconds).

 

2. Record a call using the Recordnig Module and got the user to hang up.

 

3. Analyse wave form of the recorded file (I'm using Sound Forge to do the job, and there are many other software to choose from). At the end of the file, I saw blocks of repeating signals. I can then get the 'on' time and 'off' time for this end of call tone, as well as the number of repeat tones. I also trimmed the 'on' portion, and undertook a spectrum analysis to realize there are 2 frequency peaks --- until then I have no idea why 2 frequencies are mentioned in the TSP configuration for Disc Tone1 and Disc Tone 2.

 

4. I proceeded with Dialogic TSP configuration putting int the parameters. I then have to restart the whole system and get the disconnect recognized to my pleasure! (Re-starting the dialogic service or voiceguide are not enough). The disconnect takes around 6 seconds to be effective in VG.

 

I hope my experience helpful to someone else as well (that's where forums are great!). May I also ask our vg experts to correct me if I make any mis-understanding above.

 

Thanks to all VG experts and forum contributors!