Business Enterprises can take full advantage of their Brekeke SIP Server or IP-PBX to not only communicate within their local IP Network, but also outside to the traditional PSTN network, by leasing a SIP trunk from an Internet Telephony Service Provider (ITSP). A SIP trunk will allow your Enterprise to replace traditional fixed PSTN wire lines with VoIP connections through the Internet. Also, SIP trunks from an ITSP eliminate the need for local VoIP SIP Gateways or Media Gateways.