Telenet - SIP Trunk
On this topic
Telenet specialises in the supply of broadband internet, fixed and mobile telephony services and cable television to customers throughout Flanders and Brussels over a powerful HFC (hybrid fibre-coax) network. Telenet also supplies professional communication services to businesses in Belgium and Luxembourg.
Reference website: Telenet
Before configuring the SIP trunk it is required to go through the following checklist and make changes where necessary:
- NAT (when used) created to 3CX
- Firewall Checker passed
- Firewall SIP ALG checked and if present disabled
Further setup information can be found in our Academy: 3CX Academy Basic Course
Some providers gained support and compatibility with 3CX on a specific product version. It is advisable to always run the latest version of 3CX to ensure ongoing compatibility.
Minimum 3CX Version: 3CX Phone System 15.5 SP2
Below is a short overview of the provider's capabilities and services and whether they’re supported or not:
- CLNS (Clip No Screening): No
- Catch All Routing: No
- Fax T.38 support: No (Audio fallback only)
- CLIR (Number Suppression): Yes
- DTMF via RFC 2833: Yes (must be enabled by Telenet)
- Codec Order: G711A
- NAT Support: Yes
Configuring the Trunk with 3CX
The general instructions outlining how to add a new SIP Trunk to your 3CX installation can be found here.
Adding the Trunk
Go to “SIP Trunks” and select “Add SIP Trunk”
- Select Country: BE
- Select Provider in your Country: Telenet
- Main trunk number: This will have been provided to you by Telenet. You must enter the number in the National number format without the leading 0 (e.g. 25551212)
- Press OK
Under the “General” tab in the “Trunk Details” enter the registrar IP as given to you by your Telenet representative. This will usually be a Private IP of the on-premise device Telenet has provided you with.
Once you have done this, scroll to the top of the page and press OK.
Adding Additional DIDs
To associate all other DIDs/Numbers you have in your Telenet account with 3CX, go to the Management Console → SIP Trunks, double-click on your Telenet Trunk and go to the “DIDs” tab.
Here you should already see 1 entry that is the Main Trunk number you have set. Add all other DIDs/Numbers you have to the list in the National number format without the leading 0 (e.g. 25551212) and press OK.
Creating Inbound Rules
Now that you have associated all your DIDs/Numbers with your SIP Trunk in 3CX, you can create Inbound Rules to set where calls will be routed when those numbers are called. Instructions on how to create Inbound Rules can be found here.
Important: Creating Inbound Rules for all your DID numbers is necessary when using Telenet SIP Trunks. Failing to create an Inbound Rule for a DID number will result in calls to that number failing.
By default, all Telenet Trunks do not support RFC2833 DTMF tones. As 3CX requires this to correctly operate, you must come in contact with Telenet Customer Service and ask them to enable RFC2833 for your Trunk.
Important: Not doing so will result in outgoing calls that terminate to an IVR to not be able to navigate the voice menu as DTMF tones sent will not be recognized.
When configuring Telenet SIP Trunks in 3CX, all numbers should be entered in a National number format without the leading 0 (e.g. 25551212), otherwise call routing will fail.
Outbound Caller ID
Telenet Trunks do not support Clip No Screening, meaning that you can present only your own numbers. Those must be input in a National number format without the leading 0 (e.g. 25551212).
When configuring your Outbound Rules make sure that all numbers are dialed in the International number format (e.g. 003225551212). More information about how to create Outbound Rules and how they work can be found here.