Anyone with experience in this? We have a single number, an external conference bridge number. When users attempt to dial it, the call runs through our OCS mediation server, and is placed with the cisco gateway. I see the the call come across the IP telephony gateway. However, the call is immediatlely dropped, and we see a SIP 603 error, of Declined. If I dial the same number from my Cisco phone, it works just fine.