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POTS is solid, reliable telephone service. POTS lines are static. If you have a POTS line in place, it uses the same capacity whether zero or a hundred calls are made or received on the line. SIP trunks are dynamic. They only exist when a call is taking place. '''SIP''', or Session Initiation Protocol is a newer technology. SIP is Voice over IP (VoIP) so calls are transmitted over the Internet.