[Asterisk-Users] Rings - How to set number

[Tim P]

Maybe this marks me as a real newb but where do I set the number of
rings that a phone has before it sends it to voicemail?

Also for some odd reason when I ring an extension attached to my
sipura 2100 ATA it takes it about 12 seconds to start ringing after I
dial it (sits there with dead air on the calling phone).

Any idea on these, am I missing some simple configuration switch for either?