Cannot transfer to extensions in the 100 range

HI, apologies if this has been answered but I am pulling my hair out over it,

I have been using Asterisk 1.6/FreePBX and extensions 100-300, all calls go where they need to and call transfers to all extensions including the 100 range work fine. Recentely, yesterday, I installed a new PBX with Ast 1.4/Freepbx only to discover that all works well but extension ranges 200 and 300 cannot transfer calls to the 100 range ( however they can dial the 100 range to call them) when transfer is pressed we see on the phone display it accepts the first two digits 10 then we get rapid tones also on the display it only show the first two digits of the range. I have come accross this a few years ago but cannot recall exactly what was done, is this a difference between Ast 1.4 and 1.6 and does anybody know if it can be remedied, any help is al;ways appreciated,


You already asked this question on the trixbox forum. Double dipping is frowned upon.

Especially since you gloss over teh fact you are running trixbox (this is the FreePBX support forum) and don’t mention the type of phone.