Adding cellphone to ringgroup in AA50 Appliance

Hi,

I’m having an aa50 appliance.
The thing is working great.
I am just missing one important feature and that’s the ability to add external cellphone numbers to a ringgroup.
There is a file editor where you can edit the conf files manually.
But I can seem to get it to work.
Does anyone else experience the problem aswel? Maybe someone knows a solution?

This is the syntax I put in the ringgroup conf file:

exten=s,1,NoOp(mobieltjes)
exten=s,2,Dial(SIP/049893xxxx@outgoing_Belgacom_FAX,20,m)
exten=s,3,Hangup

Kind regards
Kenny