The Nortel CS 1000E IP Private Branch Exchange (PBX) does not support inbound early media in all configurations in the Microsoft Office Communications Server 2007 R2 environment. Currently the Nortel CS 1000E IP PBX supports inbound early media only in the Direct SIP configuration (without the Nortel MCM and with Secure Real-time Transport Protocol [SRTP] disabled).
Depending on the specific Nortel CS 1000E IP PBX deployment configuration in the Microsoft Office Communications 2007 R2 environment, you may experience the following symptoms and functional issues.
more info here
Friday, March 27, 2009
Inbound early media functionality is unsupported when you deploy Microsoft Office Communications Server 2007 R2 together with the Nortel CS 1000E IP PBX
