Read our guide on how to configure a SIP Trunk / VoIP Provider. This covers the generic steps required to configure a trunk with 3CX. Take note of the below special configuration requirements for UPC Business: Enter the main trunk number in national format (e.g. 0334656547). 3CX has only tested UPC over the Internet as an authentication based provider and cannot guarantee that VPN or IP based trunk users will work correctly.

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UPC Business SIP Trunk Configuration Guide | Switzerland

Thread starter KaterinaK_3CX
Start date Feb 24, 2021

Status: Not open for further replies.

KaterinaK_3CX

Feb 24, 2021

Read our guide on how to configure a SIP Trunk / VoIP Provider. This covers the generic steps required to configure a trunk with 3CX. Take note of the below special configuration requirements for UPC Business:

Enter the main trunk number in national format (e.g. 0334656547).
3CX has only tested UPC over the Internet as an authentication based provider and cannot guarantee that VPN or IP based trunk users will work correctly.