Alarm Relay recommended the IP Datatel CDMA Cat or Bat to me (cheaper monitoring). The Cat is cellular only and the Bat is IP and cellular.
I just installed this and it could not have been easier.
I don't have much running on my Elk M1, so I was able to power the CAT directly from the Elk to get back up battery.
The Cat uses dial capture, so I connected a total of 4 wires. 2 for power and 2 for phone.
I got the CAT for $150 online, it comes in its own enclosure.
I called Alarm Relay at noon and had a service tech call me at 4 to put in the correct Contact ID codes.
The IP Datatel CDMA Cat or Bat units are Verizon and surprisingly are cheaper monitoring than the Uplinks that use GSM (additional $5 per mo approx).
I paid $15.95 per month for cellular burglary, fire, panic, etc.
You prepay the year $15.95 x 12, plus one time $30 setup fee. Total of $221.40 plus the $150 for the CAT off eBay.
Setup took about 25 minutes and I was very happy and surprised at how quickly the system reported a violation to Alarm Relay. This is my first Alarm so I expected the old school modem sound and 20-30 seconds to connect.
To my surprise when the alarm goes off and they saw the violation in 5-10 seconds.
Hope this helps.
Jeff