[VoiceOps] Alarm panels and how they dial DTMF digits - pots migration from DMS to Metaswitch issue

[Matthew Yaklin]

> I wouldn't be surprised if you were seeing it try to dial DTMF, then pulse, then DTMF again if the call didn't cut through very quickly.

----- ADTRAN went straight to examining the dialing-plan in the TA5000 when I shared my config with them for those exact reasons. We both agreed since digits were missing in the middle in many cases this was probably not a dialing-plan issue or DTMF/pulse dial issue. They signed off on our config as proper.

----- My last hopeful attempt is that ADTRAN appears to have engineering superuser temporary passwords for the TA5000 that can see things I cannot. So I have to get a test scheduled with them. I had a tech out at a GR303/TA750 site today and no matter what we tried those two digits in my previous example were always missing.

----- I just need to motivate people to keep working this as people above us said why are we spending this much time on a dozen pots lines and the alarm vendor is difficult to work with. They can go to Verizon or get that cell phone setup for alarm panels. Killing off a DMS switch is a big savings and each month costs $$$.





> On Feb 13, 2023, at 3:47 PM, Jay Hennigan via VoiceOps <voiceops at voiceops.org> wrote:
> 
> On 2/13/23 11:48, Matthew Yaklin wrote:
> 
>> --- The issue is that when the alarm panel dials the INVITE from the TA5k does not contain the correct digits dialed. A couple of digits are missing for example. Sometimes a call does manage to squeak through properly. If the digits do get to the Metaswitch properly the call completes fine. Same exact symptom with GR303. In SAS (meta's service assurance server that contains debug output) I can clearly review what digits reach the metaswitch via GR303. In this case I will see missing digits as I know the number the alarm panel is supposed to dial and a gap of time which should have contained digits.
> 
> OK, so the FXS port of the local Adtran device isn't reliably decoding the DTMF from the panel. Could be frequency, level, or twist. See if there are knobs for receive level and/or impedance for the specific line port used by the panel. I'd start with level, bump it up and down 3dB at a time and see if it starts decoding reliably. If possible bracket it to see where it fails again and set it in the middle.
> 
> Changing impedance might help if it's twist. Sometimes the options include series capacitance. Likely going to be trial-and-error.
> 
> -- 
> Jay Hennigan - jay at west.net
> Network Engineering - CCIE #7880
> 503 897-8550 - WB6RDV
> 
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