omni iie phone dialer problem

For years I've had a rule that calls my mobile phone when my driveway sensor is tripped and the system is set to away mode and it work fairly well. Over that last 6+ months when it calls it will not play the announcement and will not respond to key presses.  If I dial in independently, it will respond to the yes and voice prompts will work.  To make matters worse, it then keep calling every few minutes for about 4 times.  I've tried adding pauses and beep, but it still will not work consistently.
 
I would like to switch to the email notifier, but I've heard it's buggy.  I'm currently on 3.11 - I can only upgrade with a ROM replacement.  Any help would be appriciated.

Have you changed your mobile phone in that period of time?

I have, but I also get the same behavior if I have it call a landline.

Have you changed anything on the line to the panel?
Added voice mail or call waiting or anything?
Does the dialer work reporting to the central station (digital codes)?

I don't have a service with a central station so I don't know if the digital dialer works properly.  I'm now wondering if my answering machine could be interfering somehow.  The property is remote, but I can have someone disconnect it tomorrow to try it out.  My broadband connection is a DSL line that shares the same line, but that has been in place for many years now.

The issue you are describing sounds like a CPA issue.  Call Progress Analysis provides a sort-of "is someone there" trigger on the line.  It could simply be a phone company issue or an issue with devices on the line at the site location.
 
Also, DSL filters can degrade or be damaged.  After a period of time, having multiple devices on the line can also degrade the line because of oxygen inclusion in the copper wiring or due to a tear in the insulation and rain/moisture/humidity leakage into the line.  
 
Removing devices from the line such as telephones is a great suggestion and may help, but ultimately you may want to have the phone company run a diagnostic on the line (ask for the line certification print-out).  You may also want to try another DSL filter or try a connection directly to the access terminal on the outside of the house using a portable DSL filter.
 
Personally, every time we had an issue with analog lines, tech would ask for a line cert and the phone company would fix the issue as it was usually on their end.
 
 
 
You are correct - my experience with the email notifier is buggy.  Sometimes it emails, sometimes it won't. Personally I don't like it (but working on another option which I hope to post in the future).