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USB Voice Modem Users - Do Not Update Windows to 1903

Voice modem users,

Microsoft has broken TAPI with Windows 10 1903.

If you update workstations to this Windows version, you will struggle to get any voice functions from your voice modems, especially with the Multi-Tech USB modems.

Voice modem users, Microsoft has broken TAPI with Windows 10 1903. If you update workstations to this Windows version, you will struggle to get any voice functions from your voice modems, especially with the Multi-Tech USB modems.

We installed the update here and tested against the Multitech modem. We did have to re-install VTScada and also tweak the modem registry setting to add back in the Network Service user. The registry key is at -

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class{4d36e96d-e325-11ce-bfc1-08002be10318}

5d08cf170d88f

But, it did work. If it turns pout to be a bigger issue, we will keep it updated here.

Remember, we don't handle the modem or voice in the same manner as WIN911. So a problem or a even a fix for them, may not have the same impact on us.

But it is nice to get a heads up like this so we can get ahead of it. Thank you!

We installed the update here and tested against the Multitech modem. We did have to re-install VTScada and also tweak the modem registry setting to add back in the Network Service user. The registry key is at - Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4d36e96d-e325-11ce-bfc1-08002be10318} ![5d08cf170d88f](serve/attachment&path=5d08cf170d88f) But, it did work. If it turns pout to be a bigger issue, we will keep it updated here. Remember, we don't handle the modem or voice in the same manner as WIN911. So a problem or a even a fix for them, may not have the same impact on us. But it is nice to get a heads up like this so we can get ahead of it. Thank you!

Doug Spurrell

If you tire from managing modems and have an internet connection to your SCADA server, note that you can always use Twilio for voice and SMS alarms.

If you tire from managing modems and have an internet connection to your SCADA server, note that you can always use Twilio for voice and SMS alarms.

Trihedral Engineering Ltd.

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