But MagicJack and Vonage do not permit the usage of a fax Machine. Additionally, you cannot use Magic Jack or Vonage with a security service (e.g. ADT).
Vonage does support fax machines. Also that ADT system won't work when you lose power or your local CMTS is down. So no point in having it connected to DP. If you rely on an alarm you should have it at least hooked up to a landline or use a total or cell back up solution.
