Set DID for PRI channel

Asterisk Asterisk Support
1

Hi,

I have 1 PRI interface with 30 available channels and 3 diferent DIDs on it. Maybe this is a simple question but, how can i assign 1 DID for 1-10 channel, 1DID for 11-20 and 1 DID for 21-30 on outside calls?

Thanks a lot!!