Allow Outbound Calls Lync > Mitel over SIP

[tomcotton]

I've got a 3300 MXe 4.2 connected to a MS Lync 2010 standard edition server via SIP. I can call from Mitel > Lync, but when I try and dial out from Lync > Mitel I get the below SIP 404 message in Wireshark:

SIP/2.0 404 Not Found
Via: SIP/2.0/TCP 172.30.1.35:56914;branch=z9hG4bK81d43e75
From: "Cotton" <sip:+5656@lync02.panint.com;user=phone>;tag=ed7f456097;epid=F55A22AEC8
To: <sip:901942******@172.**.**.**;user=phone>;tag=0_91076512-92038546
Call-ID: eb90a2f3-5a3a-48ca-9197-edc839151b82
CSeq: 6168 INVITE
Contact: <sip:172.**.**.**>
Content-Length: 0

It looks like the Mitel is searching for SIP address of 9"phonenumber"@"Mitel IP Address" for the outgoing phone number, not finding it and returning 404. It's obviously not going to find this number as it's an external number. Is this meant to happen?? Is there a way to have the Mitel just take the number portion and pass it to ARS like a normal call?

 

[tomcotton]

Got this working - As my Lync server FQDN and sip addresses are in different domains I set 'Alternate Destination Domain Enabled' to yes and 'Alternate Destination Domain FQDN or IP Address' ***.co.uk and it's working fine.