When a call is established between two RT phones (89XX and 99XX family), the call is not recorded by Unified MCP.
State of the recorded conversation is ERROR.
When a call is established between two RT phones (89XX and 99XX family), G722 codec is negotiated for the call. If G722 is disabled using service parameters, however, the 2 RT phones negotiate iSAC codec by default (Low Loss). Unified MCP does not support G722 or iSAC codecs. Consequently, the call is not recorded.
At least one party in the established call must use a non-RT phone.