I have two problems that may or may be related so I'm describing them together.
PROBLEMS: Here are the two problems:
1) Failure to detect "brief" DTMF tones:
The program fails at times to detect DTMF tones when the outgoing message is speaking. If the caller is calling from a phone where pressing the button for a longer time (maybe a second) extends the DTMF in time, that solves the problem. From certain brands of cellphones (such as LG) where pressing the button for a longer time does not extend the length of the tone, or from a desktop phone when I briefly "punch" the button, IVM does not pick up the tone when the OGM is speaking.
Can I do anything to help the IVM reliably pick up a DTMF tone at the same time it is talking?
2) Failure to detect end of call.
When the callers hang up during an OGM, IVM fails to detect the hangup. I'm in the USA and don't know of any end of call tones--just silence. The IVM finally hangs up when I abort the IVM program entirely or when the OGM logic brings it to a goodbye.
When the caller is leaving a phone message, IVM detects some seconds of silence and then successfully hangs up! Hooray!
I tried some of the suggestions in related older queries. For example I "updated" the driver from a 2004 to a 2007 version and the entire modem started acting weird; even my caller ID software couldn't accurately display caller ID information. Oops. I reverted to the old driver and got back to where I was prior to putting in the new driver.
ENVIRONMENT: Here is some of the computer setup data. I have a Dell Inspiron operating with XP. I have an internal Conexant D850 56K V9.x DFVc modem. I have one telephone line of input. Here are my settings:
Unchecked -- Enable end of call tone detected in playback
Checked ---- Enable software based end of call tone detection
4500 ms End of call detect delay
350 ms DTMF tone detect delay
I've read a bit of the forum and appreciate the care and time some of you experts have given in helping us newcomers to the program. I've been programming since the 1960's and hope I can eventually use some of that experience to return the favor of your response here.