Having problem with the MP2's Asterisk DTMF detection

[Abdoulaye Siby]

Hello everyone

We recently started having a strange issue with one of our MP2 after updating them to SECN3.

The problem is that the MP2 that seems to be fault is not able to accurately detect DTMF from a connected analog phone. I have tried it with two different phones:

1. A VTECH cordless phone that also has a number pad on the base of the phone.
2. A Panasonic cordless phone.

With the panasonic phone, the DTMF is completely ignored. What happens is ...

1. I pick the phone up, and here the dial tone
   
2. I start dialing but no matter which number I press, I still hear the dial tone. Normally, the dial tone disappear when someone starts dialing.

With the VTECH phone, I have the following behaviour ...

1. I pick the phone up, and here the dial tone.
   
2. I start dialing but the outcome depends on the digits I press. If I press 1, 2 or 3, they are ignore whether or not they are pressed at the beginning, the middle or the end of the dialed number. But this is not consistent. Some times, I notice that the digits 6 and 9 are also ignore.

If I hang up and retry immediately, sometime the number 9 is recognized (1 out of 4 times). But with the VTECH, the digits 1, 2 and 3 are never recognized ... while the Panasonic, no digit is recognized (impossible to make a call).

Now here's the interesting part ... using another MP2 that I have with the same VTECH and Panasonic, 100% of the calls are placed with no issue at all. So the issue seems to be somehow with the other MP2 hardware. It's a brand new MP2 that I have barely used.

I have re-installed the firmware several times on it and reset it to factory defaults, but the result was the same.

Did anyone have this kind of problem? If so, how did you solve it?

Thanks for your help.

Cheers

[T Gillett]

Sounds like a faulty FXS card.

I have not heard of this previously.

Suggest you request a replacement.

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[Steve Song]

Hi Abdoulaye,

That is pretty unusual behaviour.  We can certainly replace the FXS card if that is the source of the problem.  Can I suggest you open the MP2 and check to see whether the FXS card is firmly seated on the MP2 pcb?  Perhaps remove it and re-seat it.

Cheers... Steve

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[Abdoulaye Siby]

Thanks for your quick responses.

I have opened the MP2 and I can confirm that the FXS card was firmly seated on the main board. I then went on and switched the FXS cards between two of the MP2s. The result was ...

1. The faulty FXS make the problem appear on the MP2 that was not having any issues.
2. The MP2 that originally had the faulty FXS does not even work well with the good FXS. The line says "in-use" according to the phone, and after booting it up, you can't here the dial tone.
3. After putting the FXS cards in their original MP2s, everything went back to the initial condition ... with one MP2 not accurately detecting DTMF and the other one working flawlessly.

I think that something might be wrong with the MP2 main board and the FXS.

Thoughts anyone?

Thanks again for your help.

Abdoulaye

[Steve Song]

Hi,

On 28 February 2016 at 14:49, Abdoulaye Siby <as...@mananotel.com> wrote:

Thanks for your quick responses.

I have opened the MP2 and I can confirm that the FXS card was firmly seated on the main board. I then went on and switched the FXS cards between two of the MP2s. The result was ...

1. The faulty FXS make the problem appear on the MP2 that was not having any issues.
2. The MP2 that originally had the faulty FXS does not even work well with the good FXS. The line says "in-use" according to the phone, and after booting it up, you can't here the dial tone.
3. After putting the FXS cards in their original MP2s, everything went back to the initial condition ... with one MP2 not accurately detecting DTMF and the other one working flawlessly.

I think that something might be wrong with the MP2 main board and the FXS.

Thoughts anyone?

The incidence of failure in these devices is vanishingly small, largely because there are so few independent parts.  It would be a pretty big coincidence for both the main PCB and the FXS subsystem to fail independently.  I will contact you off-list to discuss replacement.

In the mean time, I wonder whether the power supply may be at issue?  Low or variable power levels have been known to cause unusual asterisk behaviour while the rest of the MP2 appears to be working fine.

Cheers... Steve

 

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[Abdoulaye Siby]

No problem Steve

In the mean time, I will switch the power supply to see i it makes a difference.