SIP Trunking
How it Works

SIP Trunking is a replacement for traditional phone lines such as an analog lines or PRIs, saving customers up to 70% over traditional phone lines.

In a traditional set-up, the phone system looks like the diagram below. The phone network consists of a PBX or key system and provides key calling features. Behind the PBX, the phones are connected to the public switch telephone network (PSTN) via analog lines or PBX lines. Calls are placed from phones to the PSTN via these PRI or analog lines. A separate data or broadband circuit provides a separate connection to the Internet.

Business LAN

With SIP Trunking, traditional phone lines are no longer needed. Instead, voice and data are combined over a single circuit.

    • The IP PBX connects to the data network and the voice traffic utilizes the Broadband circuit in the office to connect to the Internet.  Optionally, an IAD may be used on the data network to connect to the PBX via PRI or analog lines.
    • Calls placed over the Internet are placed via a media gateway on the service provider’s network. SIP Trunking will work with old key systems or new IP PBXs, offering advanced VoIP features.
Business LAN
  • Unlike PRI lines which contain 23 channels, SIP Trunking can be purchased in increments as low as one concurrent call, so businesses buy only what they need as they need it.
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