Hi, I’m searching for an ISDN interface so that I could connect my 3CX phone system to ISDN line. I checked the support page and mostly PSTN interfaces are mentioned. I also checked this forum and all the mentions are mostly in German or Italian which I don’t understand. Can somebody please recommend me an interface for my home use? I would just need one line for one particular provider. Nothing special actually. The price is more important than the features. Thanks.