Grandstream bt100 w/ asterisk

I’ve already registered grandstream w/ my asterisk but the problem is that the ip phone (Grandstream) can’t send voice.

What should be the ideal setting of the grandstream? thanks.

Don’t know of anything ideal in this world, but what do you mean “can’t send voice”? Is this one-way audio? Or no voice at all? Some basic things to watch includes common CODEC and firewall/NAT. If you need specific help, posting relevant configs (Asterisk and BT-100) would be helpful.