hello, i hope someone can shed some light on this we have 3cx up and running at head office, using VOIP unlimited, phones all work fine at head office director now wants an extension at his home so i bought him a Yealink SIP T20P, setup an extension 201 and went to his house. phone registers, phone shows 201 on screen but can not dial out, get forbidden on screen wireshark on 3cx server shows STATUS 403 forbidden when trying to dial the reception extension from MD house for example - or any other extension firewall checker ran all fine - exit code 0 we are not using a proxy at head office or at MD house ? directors remote SIP phone is pointed at Ext IP of office FW, ports forwarded am I missing something here ? tech support agent said i need to use proxy, then i rang back later and another chap said i didnt and was using wrong firmware on Yealink. firmware on Yealink now 22.214.171.124 but still can not make a call any help please, how do i do this the company may also want extensions putting in at other directors and managers houses if this works well, so i'm trying to impress here !!