Snom 300 on CX 3300

[marcustherock]

Hi all,

i have registered a snom 300 as a generic sip phone i can dial, but it seems as soon as the called party answers, the phone drops the call. error on screen shows 'not allowed here'

can anyone give me the steps to setup, register and programme these phones? A-Z?

thanks in advance.

 

[marcustherock]

Im sure somebody knows this, please guys