# Voice Notification Via POTS Replacement Device

**URL:** <https://forum.inductiveautomation.com/t/voice-notification-via-pots-replacement-device/116156>\
**Category:** Ignition\
**Created:** [June 25, 2026, 3:10pm UTC](https://forum.inductiveautomation.com/t/voice-notification-via-pots-replacement-device/116156 "2026-06-25T15:10:15Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Gwen\_Lipinski](https://avatars.discourse-cdn.com/v4/letter/g/c77e96/32.png) [@Gwen\_Lipinski](https://forum.inductiveautomation.com/u/Gwen_Lipinski)\
**Post date:** [June 25, 2026, 3:10pm UTC](https://forum.inductiveautomation.com/t/voice-notification-via-pots-replacement-device/116156/1 "2026-06-25T15:10:15Z")

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Hello! Has anyone used a "cellphone in a box" device to connect to Ignition voice notification? I have a system switching from Wonderware to Ignition that currently uses a modem to convert to an analog line to an Ooma AirDial. I would like to keep the Ooma if possible. Could I just use a Grandstream device instead of the modem? Thanks!

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**Author:** ![justinedwards.jle](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/justinedwards.jle/32/37854_2.png) [@justinedwards.jle](https://forum.inductiveautomation.com/u/justinedwards.jle)\
**Post date:** [June 27, 2026, 5:42am UTC](https://forum.inductiveautomation.com/t/voice-notification-via-pots-replacement-device/116156/2 "2026-06-27T05:42:24Z")

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Sounds a lot like this recently revived thread:  
[Cellular Modems for SMS Notifications](https://forum.inductiveautomation.com/t/cellular-modems-for-sms-notifications/80673)

If nobody comes up with a clear answer to your question, perhaps you can find something in there that will be of use.

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**Author:** ![lane.duncan](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/lane.duncan/32/83700_2.png) [@lane.duncan](https://forum.inductiveautomation.com/u/lane.duncan)\
**Post date:** [June 27, 2026, 5:59am UTC](https://forum.inductiveautomation.com/t/voice-notification-via-pots-replacement-device/116156/3 "2026-06-27T05:59:43Z")

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Do I understand correctly that the old system uses an analog modem to communicate with the OOMA device? How do you plan to replace the analog modem? This step alone sounds difficult.

Take a look at the last paragraph of the Voice Notification Module in the manual:

> This module requires the Alarm Notification module and some SIP-compatible VoIP service

A quick search reveals the OOMA AirDial is not SIP compatible.

I suppose you _could_ write your own 3rd party module to do that…but it would be much less work to replace the OOMA.

> **[Voice Notification Module | Ignition User Manual](https://www.docs.inductiveautomation.com/docs/8.3/getting-started/modules-overview/additional-modules/voice-notification-module)**
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