Funny enough I tried to answer the question in Subject and I did not find at all what I wanted. So I decided to write.Personally I am not using any of the PSTN trunk lines but I put 2 HT-386 since I needed 3 additional POTS line (2 are used to ring the bells of the 2 doors, 2 connected to the Door Phones, 1 to DECT Phone). If I would have used in a SoHo evnetually in ISDN BRI and 2 PSTN trunk would have been my choice, ma at home I use only SIP Trunk lines. So my answer to "What PSTN trunk options do you like best in an all-in-1 IPPBX?" would have been:If Home PBX: 5 FXS, 1 FXOIf SoHo PBS: 4-5 FXS, 1 FXO and 1 BRI ISDNDo you agree ? ... I do not know but 2 FXS are not enough for sure