Chan_sip "Wrong Password"

Boy this is a real head-scratcher. I have a mix of aastra and polycom phones. I am setting them all up in a very similar way. I have one phone that registers fine with FreePBX, and all of the others get this error in the log:

sip:[email protected]:5060 failed for ‘192.x.x.151:5196’ - Wrong password

But notice that the two IP addresses are not the same…151 was the DHCP address when we first turned on the box, 250 was the ip address we set as static.