Configuring KHOMP UMG 104 and UMG Modular Gateways
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Once you familiarize yourself with the basic concept of SIP Trunks (https://www.3cx.com/docs/manual/sip-trunks/) proceed to add a PSTN gateway to the PBX. This guide takes you through the steps of configuring and installing a Khomp UMG 104 (one E1/T1 link) and UMG Modular 300 - a multi PSTN gateway which supports E1/T1, FXS, FXO and 2G or 3G GSM.
Note: The device must be local to 3CX, in the same subnet and/or locally routed subnet (including site to site VPN).
Step 1: Prepare Your Khomp Gateway
To download the KHOMP UMG latest available firmware, sign up to the Khomp Customer Support Website here, where you can find firmware updates and documentation. For complete installation instructions please follow the printed version of the product’s Quick Guide, which is shipped with the product, or can be found on the Customer Support Website.
Step 2: Add and Choose a Device
Navigate to the “SIP Trunks” node within the 3CX Management Console and select “Add Gateway”.
The fields should be filled as follows:
- Select Brand: Khomp.
- Select model/device: Khomp UMG Modular 300 or Khomp UMG 104.
- Number of Physical PSTN Ports on device: The amount of lines available on your gateway to receive or make calls through the PSTN.
- For example, if your UMG Modular 300 has an E1 link (up to 30 simultaneous calls) and 2 GSM/3G lines, the number of physical PSTN ports is 32.
- Main Trunk No: Define the number of your PSTN lines which should act as catch all destination. Commonly your most important number of all.
Click “OK” to save.
Step 3: PSTN Line Setup
Now there are some device and line specific options which need to be defined.
- Registrar/Server/Gateway Hostname or IP: Enter the current IP address of your device.
- Numbers of SIM Calls: For the UMG 104 the number of sim calls is automatically set to 30. The UMG Modular 300 gateway depends on the modules you attach. Example, for each FXO port you add 1 call, E1 port is 30, T1 is 24.
Step 4: Khomp Wizard
By selecting the Generate config file, the 3CX Management Console will directly open the UMG’s 3CX Wizard as set in Registrar/Server/Gateway Hostname or IP field (default login: admin / khomp).
According to the PSTN modules of your specific device (ISDN, GSM, FXS etc) some sections mentioned below will be displayed or hidden from the UI of the Khomp device.
Within the PBX section of the configuration wizard, enter the IP address/Domain and the SIP port of your 3CX PBX. In case the Type of Authentication set in 3CX is “Register/Account base”, it is required to enable the register on the gateway and set the user, authorization user and password, as shown above.
The next section will configure the physical lines of your gateway. Within the “Link E1/T1” section:
- Connected to defines if UMG will generate (PBX option) or receive (PSTN option) the TDM clock. Normally this option is PSTN.
- Operation type: E1 or T1
- Signaling: R2 or ISDN
- Routing prefix: Set a routing prefix if necessary. The routing prefix field can be used to route calls through this trunk when outgoing calls start from a specific number. For example: “2,3,4,5” will route calls starting from these numbers through this PSTN trunk.
Within the “GSM section” you can view which SIM cards are enabled and select a routing prefix. For example: if mobile numbers in your country start with 8 or 9, put “8,9” in this field.
Within the “FXS” section you can register each line individually and define the extension number, user and password. The UMG will create SIP users for selected extensions and it will register them on the 3CX domain. If the extensions do not exist in 3CX, they will need to be created from within the 3CX Management Console, read how. Press “Save”. Then click on “Apply” to activate the settings.
Go back to the 3CX Management Console and click “OK”.
To check the status of the port go to “Monitoring > Dashboard”, on the Khomp UMG.
Step 5: Add Inbound Rules
To setup “Inbound Rules” visit the 3CX Admin Manual: Inbound Rules - Routing incoming calls.
Step 6: Add Outbound Rules
To set up “Outbound Rules” visit the 3CX Admin Manual: Outbound rules - Routing outgoing calls.