I am having an issue with a DX650 disconnecting the from  the MCU after 15 minutes.  The DX is registered to CUCM 9.1 and the MCU  is registered to VCS.  I have a SIP trunk between the VCS and CUCM.  The  MCU is giving the following disconnect reason...

I have a MSE 8510 blade and I have the auto attendant configured for  7007.  When I call from an endpoint I get connected for one seconnd an  then the call drops.  The log on the MSE says that it cannot add  participant 51 because it has too many par...