# AirLink RV50 with redundancy **URL:** \ **Category:** Ignition\ **Created:** [October 10, 2020, 9:12am UTC](https://forum.inductiveautomation.com/t/airlink-rv50-with-redundancy/39562 "2020-10-10T09:12:17Z")\ **Posts on this page:** 1\ **Showing post:** 15
**Author:** ![David\_Stone](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/david_stone/32/79749_2.png) [@David\_Stone](https://forum.inductiveautomation.com/u/David_Stone)\ **Post date:** [February 4, 2025, 8:48pm UTC](https://forum.inductiveautomation.com/t/airlink-rv50-with-redundancy/39562/15 "2025-02-04T20:48:24Z")
Disclaimer: I wrote this how-to: > [@HOW-TO: Use a Teltonika 4G Modem as an SMS Dialler](https://forum.inductiveautomation.com/t/how-to-use-a-teltonika-4g-modem-as-an-sms-dialler/99613): > > There has been some complaints about the SMS capability of the SMS Notifications module that I have seen recently. Most of these centre around how the Sierra Wireless SMS modems have no feedback on whether an SMS has been sent or if the modem is even connected. I personally have a couple of issues with the module: The Sierra dialler uses UDP, so there is no confirmation a packet ever made it to the unit. The dialler cannot have a gateway address configured on it, so it MUST be on the same su… It is not "supported" by IA, but it is more reliable and you can do much more with a bit of scripting to verify things are working every time you send messages etc. --- _[View the full topic](https://forum.inductiveautomation.com/t/airlink-rv50-with-redundancy/39562)._