1&1 Versatel - SIP Trunk
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About 1&1 Versatel
Previously known as Versatel, in 2016 Versatel joins forces with 1&1 and becomes 1&1 Versatel to provide one of the most reliable and efficient services available in the German market.
Reference website: Versatel
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 SP3
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 support: No
- CLIR (Number Suppression): Yes
- DTMF via RFC 2833: Yes
- Codec Order: G711A, G711U
- NAT Support: Yes
- 302 Diversion Support : Yes
Versatel Internet Connection
Versatel SIP Trunks can only operate over a Versatel internet connection. This means that you must have a Versatel internet connection if you intend on using Versatel as a SIP Trunk provider.
Disabling SIP ALG
Versatel will provide you with equipment in order for your internet connection to work. This is usually a Cisco 800 series router which by default has SIP ALG enabled. As SIP ALG can cause unpredictable behavior for both your SIP Trunk and any remote IP Phones, it must be disabled.
To disable it, contact Versatel support and ask them to disable it for you. What they will do is remotely log into your router via command line and enter the following commands:
- configure terminal
- no ip nat service sip udp port 5060
- no ip nat service sip tcp port 5060
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: Versatel
- Main trunk number: This will have been provided to you by Versatel. You must enter the number in the International dialing format (e.g. 00495114740240)
- Press OK
Under the “General” tab, in the “Outbound Proxy” field enter the SIP Proxy IP address provided to you by Versatel’s connection information letter. Then in the “Authentication” section enter your SIP Username and Password (these will be supplied to you in the same letter).
Once you have filled in these fields as given to you by Versatel, scroll to the top of the page and press OK. If you refresh the page you should see your Versatel Trunk appear as Registered.
Adding Additional DIDs
To associate all other DIDs/Numbers you have in your Versatel account with 3CX, go to the Management Console → SIP Trunks, double-click on your Versatel 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 a International dialing format (e.g. 00495114740240) 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 Versatel SIP Trunks in 3CX, all numbers should be entered in the International dialing format (e.g. 00495114740240), otherwise call routing may fail.
Outbound Caller ID
Versatel Trunks support Clip No Screening which means you can present any number as outbound caller ID. In order for this to work, in any field within 3CX that the Outbound Caller ID is set, the number you want to present as CLI must be entered in the International dialing format (e.g. 00495114740240).
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.