[Asterisk-Users] problem with caller-id

[Rudolf E. Steiner]

Hi.

If i call a phone (Giptel G200) over SIP, the "number" of caller looks 
like "asterisk at xxx.xxx.xxx.xxx" (the IP of the Asterisk-server). 
How can i modify that, so the called phone can call back the caller 
on his _real_ "number" (like "5 at sip.hostname.com" or 
"user at sip.hostname.com")?

-- 
Rudolf E. Steiner
res-1 at communicate.at