SIP Link OUt of Service

[doctora]

when I issue the command SIP LINK STATE ALL
I get that the link is out of service.

We are trying to connect to an exchange server 2010.  Should I be looking at the exchange or at the mitel.  I am unsure about the message. I am new and as I read the message I look at it two ways.
It is not seeing the exchange server.
OR
My config is wrong.

My question is would I get this message if exchange was offline? 

Thanks
Mark

[doctora]

An update on this issue.

I am using the Mitel Configuration Notes SIP CoE 10-4940-00117 Configure for use Exchange 2010

When I am in exchange and type Test-UMConnectivity - UMIPGateway:<gateway> -Phone:<Phone> | fl

it calls the phone in question and replies any digits entered(In other words it appears to work). 

Then when I try and dial the extension to the sip group I do not get the message Out of Service I get dead air.  After a few minutes if I dial the extension to the sip trunk I get the Out of Service message again.

[fcummins]

I'm about to start trying to integrate Exchange 2010 and our Mitel 3300 system.  Can you tell me where you got that document from?

TIA.

edited to add - found the document from Mitel.  Besides that document, was there any other documentation you used - specifically from Microsoft?