•You need to know the IP address and port of the COMtrexx

•The PBX system used as the a/b gateway

−Public switched tel. networks > VoIP > Provider

•A provider based on the following template: International > int Auerswald PBX sub system IPv4 V201

−Import > Selection of the template > Import provider

−SIP > Domain: COMtrexx IP address

−SIP > Registrar: IP address and port of the COMtrexx

−Settings > Sub-system operation: on

−Settings > The provider has emergency call ability: on

−Number presentation (outgoing) > Format of called phone number: send as dialled

−Number presentation (outgoing) > Format of own phone number: Without country code (e. g. 05306...)

−Number presentation (outgoing) > Number presentation type: In the display text

−Number presentation (outgoing) > Method of number presentation suppression: Anonymous