dus.net - SIP Trunk
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Based in Düsseldorf, dus.net is a dynamic telecommunications company that aims to provide services with quality, competence and reliability at their core. With VoIP as their core focus, their DUStel trunk service is an great choice for 3CX customers in Germany.
Reference website: dus.net
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 SP6
Below is a short overview of the provider's capabilities and services and whether they’re supported or not:
- CLNS (Clip No Screening): Yes
- Catch All Routing: Yes
- Fax T.38 support: Yes
- CLIR (Number Suppression): Yes
- DTMF via RFC 2833: Yes
- Codec Order: G722, G711A, G711U, G729, GSM, iLBC
- 302 Diversion Support : No
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: DE
- Select Provider in your Country: dus.net
- Main trunk number: This will have been provided to you by dus.net. You must enter the number in the National number format (e.g. 05114740240)
- Press OK
Under the “General” tab in the “Authentication” section enter your Authentication ID and Password (these will be supplied to you by dus.net).
Once you have filled in these fields as given to you by dus.net, scroll to the top of the page and press OK. If you refresh the page you should see your dus.net appear as Registered.
Adding Additional DIDs
To associate all other DIDs/Numbers you have in your dus.net account with 3CX, go to the Management Console → SIP Trunks, double-click on your dus.net 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 a national number format (e.g. 05114740240) and press OK once you have finished.
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.
When configuring dus.net SIP Trunks in 3CX, all numbers should be entered in a national number format (e.g. 05114740240), otherwise call routing may fail.
Outbound Caller ID
Dus.net Trunks support Clip No Screening which means you can present any number as outbound caller ID. These numbers can be in National, International or E164 format.
When configuring your Outbound Rules make sure that all numbers are dialed either in the National (e.g. 05114740240) or International (e.g. 00495114740240) format. More information about how to create Outbound Rules and how they work can be found here.