MTN Business - SIP Trunk (Cyprus)
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Since 1994 MTN has been offering their services throughout several countries in Africa, Europe and Asia. MTN’s business SIP trunk offers a high level of service and support and, as one of the biggest telco providers in the world, is a perfect fit for 3CX customers in Cyprus.
Reference Web Address: MTN CY
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
In order to configure an MTN Business SIP Trunk (CY), an MTN internet connection is required. MTN Business SIP Trunks can only operate over an MTN circuit. For more information about this, contact your MTN Business representative as this part is outside the scope of 3CX.
Below is a short overview of the provider's capabilities and services and whether they’re supported or not:
- CNS (Clip No Screening): No
- Catch All Routing: Yes, support for one SIP Trunk
- Fax in T38: No
- CLIR (Number Suppression): Yes
- DTMF via RFC 2833: Yes
- Codec Order: PCMU, PCMA, G729
- NAT Support: Yes
Configuring the Trunk with 3CX
Adding the Trunk
The general instructions outlining how to add a new SIP Trunk to your 3CX installation can be found here.
Go to “SIP Trunks” and select “Add SIP Trunk”
- Select Country: CY
- Select Provider in your Country: MTN (CY)
- Main trunk number: This will have been provided to you by MTN. Enter in an 8-digit format.
- Press OK
This will take you to the SIP Trunk settings. Under the “General” tab in the “Trunk Details” section enter the Registrar IP address provided to you by MTN.
After doing this, scroll to the top of the page and press OK to create the SIP Trunk in 3CX. At this point your MTN Trunk should be registered.
Adding Additional DIDs
To associate all other DIDs/Numbers you have in your ΜΤΝ account with 3CX, go to the “Management Console → SIP Trunks”, double-click on your ΜΤΝ Trunk and go to the “DIDs” tab.
Here you should already see 1 entry that is the Main Trunk number you have set. To add all other DIDs/Number, you must list them in a 8-digit format 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 MTN SIP Trunks in 3CX, all numbers should be entered in a 8-digit format otherwise calls will be rejected.
Outbound Caller ID
MTN Business SIP Trunks do not support Clip No Screening which means you can not present any number you want when calling outbound. Only DIDs that exists on the trunk can be sent, not numbers from a 3rd party. To do this you will need to format the DDI for example “22XXXXXX”. Under the “Outbound Caller ID” of the individual extension.
There are no special instructions regarding Outbound Rules that are required.
More information about how to create Outbound Rules and how they work can be found here.
Numbers can also be dialed in e164 format (e.g. 0035722XXXXXX).