Redoxoder, have you already solved tranfer call from Gigaset 470IP ?
I have the same problem. The new firmware (2184), SIP refer = ON....but nothing happends when I try to re-connect the call to another extension.
I tried all variable settings on extensions in 3cx (header,re-invite, audio), no success.
I' am new with 3cx and I consider buying it,but this is big obstacle.
Thank you very much for any help.