I'm looking at a new cloud based PABX but want to try out 3CX as the on-site server did not work at all for me.
I've now created one extension and the following link
https://www.3cx.com/sip-phones/yealink-t20p-t22p-t26p-t28p/#h.eu8l0fu5cgny
Does not tell you where you get the details for...
HI, Thank you so much for your reply :-) When I try to put in a range 9000-10999, it wont let me put in more than 5 digits. Please see below if i understood you correctly.