[Asterisk-Users] pickupgroup and callgroup on zapata.conf , how they work ?

[Pedro Howat Rodrigues]

Hi,

I'm trying to figure that out . I've already read all the information I 
found on wiki , and googled that too .
But I still can't understand how exactly they work.
"...you can pickup a ringing phone if you have a group in your 
/pickupgroup/ that is in their /callgroup/."
what does that exactly mean ?

if someone could point me to somewhere I can find more information or 
help me to understand that I would be really happy =] .

thanks,
Pedro