TIPS FOR ALARM USERS: PDS recommends testing your fire or security equipment weekly and report any defects to us immediately for service. More information can be found on our Website on testing procedures. Notice to Internet based phone line users: Communications from the alarm equipment to the monitoring station are known to have a higher chance of failure when using services like; Verizon Fios, Comcast cable, Vonage, etc... We recommend back-up radio communication equipment be installed for higher security and better reliability. Please call for more details.