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We have ATAs by AudioCodes. We have both 1248 and 124 units. We are having issues with DTMF working with the Emergency Blue Lights and our All Campus Alert System. We can connect with each of the units but once connected they do not seem to pass DTMF correctly. Any help would be great.
according to the zoom certified audiocodes ata as of 8/23/2023, I do not see 1248 or 124 as being certified by zoom. Note that mp-124e is certified.
please also see:
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Hello @gs283260 ,
Very familiar with the MANY issues surrounding DTMF while using Zoom and AudioCodes ATA's.
Have several MP-1288s deployed in multiple datacenters across a large university campus, support an on-site PSAP along with hundreds of Blue-Light Phones, Intrusion Alarms, Fire Alarms, Access/Gate Panels etc.
Have clearly shown over 100's of hours of testing between Zoom and AudioCodes (Engineering and R&D) over MANY months; DTMF is basically non-operational when trying to pass it through Zoom. Apparently this issue stems from how Zoom has chosen to implement things like RFC2833, G.711 and OPUS
This is a known issue that is not getting enough attention!! *cough* Zoom Phone Engineering *cough*
The only fix that we have found is to completely bypass Zoom for any equipment that needs to send DTMF. We have had to implement intra-ATA routing between our MP-1288s. This adds further headaches in administration not to mention we have hundreds of CAP licences that are useless.
On-prem analog infrastructure is a key component to a large organization moving to a new phone system; and it is critically important as it supports services like 911 and Fire Alarms.
What is truly disheartening is that Zoom seems to consider on-prem analog infrastructure a small and insignificant portion of their Zoom Phone product to apply the needed engineering cycles to actually fix this problem. I won't even start to get into the hot mess that is managing a AudioCodes MP-1288 and Zoom.
I know many folks who work at Zoom and honestly think Zoom is a great partner despite this issue. Zoom Phone is an excellent VoIP solution that really elevates Zoom to a World-class UCaaS platform; but the fact that large on-prem analog issues can't be addressed, leaves me scratching my head.
If you or anyone else on this forum ever wants more details about what we have had to do to get DTMF functioning, Send me a DM and I would be happy to meet or take a call.
Hope this is helpful