Hello, I am using 3cx 7 and i am verry pleased about it, But i want to know if something is possible with this system. I have 1 sip trunk (voipbuster), with that sip provider i can use more phonenumbers. example: if u have 2 frizboxes or other sip divices i can use the same sip provider with the same login and password but send a other (extern) caller id. Now i want to use for the 3cx system tyhe same principle. Now i have to use 3 voipbuster acounts for 3 numbers (caller id's) extention 1 uses vb 1 extention 2 uses vb 2 extension 3 uses vb 3 What i want is that all the xtentions can use 1 vb acount but send all 3 a other extern number. The reason??? I have 3 butgetphone acounts and 2 pstn lines so i have 5 numbers. I have to pay for the 2 pstn lines and budgetpone(sip) if i call to outside numbers. Voipbuster is free and intervoip cheaper then a normal line. So i want to call with 1 vb acount but use 3 or 5 caller id's (voipbuster accepts 5 caller id's and 2 parallel calls) who can help me??