Hi, I have a license for 16 sip trunk, but in 724 in C4 I only see 8 SIP trunk. How can I add the other sip trunk? Is it because it's a 7200-S that I can not change the setting?

You will need to change another virtual cabinet to be sip trunk, then you can add those additional members to the sip trunk group

yes, thanks found that in virtual card change, in previous installation tool you could change that in 724....