What is the PSTN?
PSTN stands for the Public Switched Telephone Network. Generally this refers to the analog phone line standards that are almost universally implemented, plus the T-Carrier trunks such as T1 lines and ISDN PRI trunks that support PBX systems. The PSTN is constructed on a circuit switched model, as contrasted with enterprise VoIP systems that are packet switched.

Enterprise VoIP
We offer business grade VoIP solutions including hosted PBX & IP Phones, plus telephone lines including POTS, T1, ISDN PRI and SIP trunking. Multi-location site solutions include MPLS and VPLS services. Line services have instant online pricing. Other services quoted promptly. Use this handy form...

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Service Type *	High Speed Internet AccessVoice (SIP/LD/Local/VoIP/POTS)Integrated Access (Voice/Data/Flex/PRI)Multi-Site Networks (MPLS/VPN/WAN/P2P)Network Services (Firewall/Collocation)
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You may call a Telarus telecom consultant toll free anytime at 1-866-436-7868 and mention Reference #: 129701 to get our best line and network bandwidth service prices, for business and organizational locations only. Sorry, no residential service available. For residential users and home offices, we recommend Affordable VoIP Phone Plans.