Make anonymous calls

Hi,

Please forgive me for my bad english. I’m a french pepople.

I’d like to make anonymous calls. Actually, I’m using the keyyo sip trunk, and anonymous calls work perfectly using : Set(CALLERID(name)=Anonymous)

I’m doing some test with another provider, and The same configuration does’nt work.
I’ve tested with SetCallerPres(prohib), but it doesn’t work.

How could I make anonymous calls ?

Asterisk version : 1.4.21.2

Thanks for yous helps.

Some providers require valid CallerID and valid means CallerID from some predefined pool.
This mean - it could depend from provider also.