Swisscom Smart Business Connect
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Swisscom’s history dates back to 1852 and the company has since grown to be the leading telecommunications provider in Switzerland. Also offering its services in Italy, the company offers a wide range of internet, TV, Cloud and telephony solutions. Swisscom ensures a simple, reliable and secure SIP trunking service for use with your 3CX PBX.
Reference website: Swisscom
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 SP5
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 in T38: No
- CLIR (Number Suppression): Yes
- DTMF via RFC 2833: Yes
- Codec Order: G722, G711A, G711U
- NAT Support: Yes
Swisscom will have provided you with an eSBC device that will be installed on your LAN. The customer-side network architecture should look like in the following diagram:
Configuring the Trunk with 3CX
The general instructions outlining how to add a new SIP Trunk to 3CX can be found here.
Adding the Trunk
Go to “SIP Trunks” and select “Add SIP Trunk”
- Select Country:CH
- Select Provider in your Country: Swisscom Smart Business Connect
- Main trunk number: Enter the main/pilot number. You must enter the number in the E.164 number format (e.g. +41123456789)
- Press OK
Under the “General” tab in the “Trunk Details” section enter the IP Address of the Cisco SBC provided to you by Swisscom. This device will be on you LAN, so the IP should be a Local LAN IP Address..
Now in the “Authentication” section enter the following information provided to you by Swisscom:
- Authentication ID: The SIP ID. It is usually the same as your Pilot Number
- Authentication Password: The SIP Password
- 3 Way Authentication Password: The SIP Username
Once you have filled in these fields, scroll to the top of the page and press OK. At this point if you refresh the page you should see your Australian Phone Company Trunk appear as Registered.
Adding Additional DIDs
To associate all other DIDs/Numbers you have in your Swisscom account with 3CX, what you need to do is go to the “Management Console → SIP Trunks”, double-click on your Swisscom 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/Number you have to the list in a E.164 number format (e.g. +41123456789) and press OK once you have finished.
Creating Inbound Rules
Now that you have associated all your DIDs/Number with your SIP Trunk in 3CX, you can create Inbound Rules to set where calls will be routed when those number are called. Instructions on how to create Inbound Rules can be found here.
When configuring Swisscom Trunks in 3CX, numbers must be entered in a E.164 number format (e.g. +41123456789).
Outbound Caller ID
Swisscom Trunks support Clip No Screening which means you can present any number as outbound caller ID, regardless if it’s associated with your account or not. For this to work, in any field within 3CX where the Outbound Caller ID can be set, the numbers must be input in an E164 format (e.g. +41123456789).
There are no special instructions regarding Outbound Rules that are required, numbers can be dialed either in an valid number format.