In the old days it was always landline but few homeowners have a real landline anymore. It’s possible to use VoIP which is a landline-like telephone service from your Internet Service Provider (ISP) but unless this line is wired to the alarm panel it is not an option. Keep in mind that VoIP is not a reliable communication path to a central station. Some ISPs have a fairly good service while others are horrible and the transmission just will not go through because VoIP was not meant for digital signaling rather it was designed for voice.
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