Trust Control Causes Problems

[journo]

By trust control, I meant this field in the config and not certificates.

account.1.sip_trust_ctrl=1

I assume that is the same as doing 'Accept SIP Trust Server Only -> Enabled'

When it's set to 1, I get the following and it doesnt register.
Jan 25 21:01:46 SIP [666]: SUA <3+error > [000] IP:[OUR SERVER IP IS HERE] is NO found in the dns cache,discard this message!

Note that the server address on the phone is set to voip.customername.cust.ourcompany.com, but the actual server address is voip2.tur.ourcompany.com.
voip.customername.cust.ourcompany.com is a CNAME for voip.tur.ourcompany.com.

So both addresses resolve to the same IP that is listed in [OUR SERVER IP IS HERE] above and it's still being filtered out.

Thanks
Dan