asterisk users - Dec 2005 - Wrong caller id num on Swissvoice IP10S

Hello,

I'm using Swissvoice IP10S phones. When I dial from number 11 to number 
22, on the phone with number 22 there is displayed a name set in 
sip.conf for user 11 and a number 22 (not 11). When I try to call back, 
it calls to the 22 (self). How to correct this?

In sip.conf I have:
callerid=Someone <11>

I've even tried this in extensions.conf:
exten => 22,1,Set(CALLERID(num)=11)
exten => 22,2,Dial(SIP/22)

But it doesn't work. NoOp says the correct CALLERIDNUM. What's wrong?

-- 
Best regards,
Bartosz Piec