[asterisk-users] wrong outgoing caller id with PRI lines: maybe usecallingpres involved?

[Giorgio Incantalupo]

Hi,
I have a sangoma PRI card on an Asterisk PBX. I have problem with 
outgoing caller ID: when I make an outbound call, the called party gets 
xxxxx1 instead of xxxxx240 where xxxxx is the my company prefix and 240 
is the phone extensions I call from.
I read something about usecallingpres on wiki but nothing is told about 
default and possible values. Is this parameter the real cause of my 
wrong caller id?

TIA

Giorgio Incantalupo