VigorBX 2000 - Configuring a Gamma SIP Trunk

VigorBX 2000
IP Authenticated
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The DrayTek VigorBX 2000 is compatible with SIP trunks provided by the ITSP (Internet Telephony Service Provider) Gamma Telecom.

This ITSP typically uses IP Authentication for their SIP trunks, which are linked to a fixed public IP address and do not use a SIP registration to authenticate access to the SIP trunk.

This guide assumes that the WAN interface of the VigorBX 2000 has been configured and the PBX system is connected directly to the internet connection with a fixed public IP address that Gamma have associated the SIP trunk with.

The way that the number is presented to the PBX system is significant because the trunk does not use registration; if the PBX system does not recognise the number presented or it is in an unrecognised format, the VigorBX 2000 will reject the incoming call because it is unable to route that call without a matching number configured in either a SIP Trunk or SIP Alias number.
The documentation supplied by Gamma would indicate whether the number is presented in national format (i.e. 05515552860) or international format (i.e. +445515552860)

Important Note: The SIP trunk will usually use UDP port 5060 for both inbound and outbound SIP traffic while the VigorBX 2000 uses UDP port 5070 to receive SIP calls. This means that the PBX system will not be able to receive calls unless the SIP trunk is reconfigured so that Gamma sends SIP packets to UDP port 5070. With default settings the VigorBX 2000 cannot use UDP port 5060 to receive SIP Trunk traffic because it uses this port for SIP Extension Registrations.

There are two ways to configure this:

  • Configuration Method 1: Change the Gamma SIP trunk configuration either by contacting their customer services or through the control panel, to change SIP Server port to 5070, which will then be able to work with the PBX system without needing to change the PBX's SIP Extensions Registration port and SIP Trunk - SIP Local Port setting
  • Configuration Method 2: Using the SIP port specified by Gamma, the VigorBX 2000 will need to have the SIP Extensions Registration port changed from its default of 5060 so that the SIP Local Port setting used by the SIP trunk can be set to use UDP port 5060 instead. This will require changing the port that extensions register to the PBX system with.

Configuration Method 1

Configure the SIP Trunk on the PBX system, go to [IP PBX] > [Trunks] > [SIP Trunk] and select an available Index number:

In that SIP Trunk index, configure these settings:

  • Profile Active: Enable
  • Profile Name: Give the SIP Trunk a suitable name
  • Registration: Set this to Disable
  • Register Interface: Set this to the WAN interface of the associated IP address so that calls are sent from the correct internet IP address. If the SIP calls are routed through the wrong WAN interface, Gamma will reject those calls
  • SIP Local Port: 5070
  • Domain/Realm: Enter the address of Gamma's Signalling server from your documentation from Gamma
  • Proxy: The same as Domain/Realm
  • Display Name: Leave this blank
  • Account Number/Name: Enter the main number associated with the trunk, in the format shown in your documentation from Gamma. i.e. If the DDIs are listed as 05515552860 etc, enter the account number as "05515552860" instead of "+445515552860"
  • Authentication ID: Leave this option unticked and leave the field blank
  • Password: Leave this blank
  • Expiry Time: 1 hour

The remaining settings are not specific to this ITSP and can be configured as required.

Click OK to save and apply these settings.

Once the Gamma SIP Trunk is configured with the PBX system and the SIP port and IP address settings are correct, the PBX will handle calls as specified by the Answer Mode of each SIP Trunk. This can be used to route calls to the Auto Attendant, Hunt Groups or individual Extensions. Usage of the Answer Modes is explained in this guide: Routing Incoming Calls on the VigorBX 2000

Extensions registered with the PBX system can make calls using the SIP Trunks either by dialling the trunk number then dialling the desired number or by being routed using the Dial Plan facility. This requires that the extension has permission to use the trunk to make outgoing calls. Configuration of the PBX system to make outgoing calls is explained in further detail in this guide: Making Outgoing Calls with the VigorBX 2000

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