Had both of those today, the first was an Ademco Vista-10SE over Comcast
cable in Atlanta, downloaded okay but sporatically sent Contact ID signals,
switching it to 4/2 seemed to do the trick on that one
2nd was a DSC 1555 v2.3 over a dish VOIP setup (not sure yet the specifics).
That one sent garbage if using CID, with SIA sometimes sent okay but most of
the time more garbage and 4/2 wouldn't work at all, the tech mentioned he
was hearing echos so I think a DSL filter might fix that, if not then he's
going to have to go with cell as the primary. Couldn't download that one,
the panel would pick up then get cut-off for some reason, it was wierd.
This is the ISP provider of the home the DSC panel was on
http://www.coolaccess.net/
Previously did a Vista-10SE over Comcast cable here in Dallas with no
problems at all. I guess it all depends on the network