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1. Introduction


GoTrunk is a complete fully featured SIP Trunking systems. It allows you to connect in house IP PBX (SIP Endpoint) to make and receive phone calls from the Internet and traditional telephone networks (PSTN) at the same time. It makes managing your communication easier and helps to reduce operating costs and increase productivity.


Your control panel is browser-based. The following are recommended:

  • Microsoft Edge
  • Mozilla Firefox
  • Google Chrome
  • Apple Safari

The web control panel is optimized for a screen resolution of minimum 1024 x 786 pixels.

Intended Audience

This guide is intended for personnel involved in operating in-house IP PBX. Readers of this guide should possess the following recommended knowledge and skill sets:

  • Basic computer skills
  • Familiarity with standard PBX features


In this manual, you will find a number of styles of text that distinguish between different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

stylemeaning you need to type into a program.
email field (1)
Field shown in a figure. For example:form field

Key concepts

SIP Trunking


Figure 1.1 How SIP Trunks Work.

VoIP or Internet telephony refers to communications services - voice, facsimile, and/or voice-messaging applications - that are transported via the Internet, rather than the Public Switched Telephone Network (PSTN - traditional telephony). Thanks to VoIP technology you can:

  • (1) Manage PBX safely behind Firewall.
  • (2) GoTrunk manages all connections for making and receiving Calls from traditional PSTN and Mobile (Cell) Networks.
  • (3) call any land line or mobile (cell) phone at very low rates.
  • (4) make and receive free Internet calls to other VoIP networks.
  • (5) make and receive free Internet calls to other GoTrunk SIP Trunk Clients.

Control Panel

This is a web based application which allows to manage all aspects of your SIP Trunking account. Create new SIP Endpoints, assign Caller IDs and provision inbound numbers.

SIP Endpoint

This is an SIP Enabled IP PBX typically installed at your premises where user's phones (extensions) connect to. SIP Trunk is a connection between IP PBX (SIP Endpoint) and GoTrunk network which connects calls to and from PSTN (Plain Switched Telephone Network).

Inbound number

Inbound number also called Direct Inward Dialling (DID) in USA, Direct Dial-In (DDI) in Europe, is a range of telephone numbers connected to your PBX, so it can route the call to the desired person or Ring Group (IVR etc.) within the organization.