Analog input to multicast paging

[rlsabin]

Is anyone aware of an adapter that would allow you to use an analog audio signal and convert it to multicast paging. We have a remote classroom environment with a half a dozen Yealink T22P phones and the multicast paging feature works great. What the customer would like to do is be able to interface an inexpensive time based tone generator to signal the beginning and end of class. They do not have overhead paging in place so they would like to make these tone announcements through the Yealink phones via the multicast page feature. I have been unsuccessful in searching the interwebs for such a device so I thought I would see if anyone else has run across one in their adventures.


Rick