Sorry I didn't include the line for a 8861 in that example, it should resemble the following depending on the firmware load you have   Load 8861 sip88xx.11-7-1-17 or Load 8861 sip88xx.10-2-2-16   Unless of course your renamed your load "fireware"

I think you're issue is line six, that doesn't look right for a firMware name. Below is a simple sample config: voice register global mode cme source-address 192.168.10.1 port 5060 max-dn 20 max-pool 10 load 7970 SIP70.8-2-1S load 3911 SIP3951.8-0-2-...