It is advisable to always run the latest version of 3CX to ensure ongoing compatibility. Some providers gained support and compatibility with 3CX on a specific product version.
Firewall SIP ALG checked and if present disabledįurther setup information can be found in our Academy: 3CX Academy Basic Course 3CX Version.Reference website: Proximus System Preparationīefore configuring the SIP trunk it is required to go through the following checklist and make changes where necessary: Proximus - Business Trunking with IMS services.At the moment the documentation below applies for: They offer Business VoIP services under various names. Proximus is the largest of Belgium’s telcos, and was previously known as Belgacom.