the federal communications commission order 05 - 116 , e911 requirements for ip - enabled service providers , requires interconnected voice over internet protocol service providers to deliver all emergency service calls to a voip service user &# 39 ; s local emergency service operator as a standard feature of the service . under the fcc order , voip service providers must supply emergency service if the voip service user accesses the voip service over broadband and if the voip service provider interconnects to and from the public switched telephone network . embodiments of the present invention guarantee compliance with the fcc order by routing a call as either a voip call over the internet or as a conventional call over the pstn , verifying that at least one of the voip or pstn telephony connections supports emergency service and routing calls over that connection or , if there is no connection supplying emergency service , restricting calling over the voip connection .