| Member type | Name | Description | 
| IUnknown | *m_pFTM | Pointer to the free threaded marshaller. | 
| CMSPAddress* | *m_pMSPAddress | The pointer to MSP address object. It is used to get the default terminals if the application doesn't select any. It also carries a refcount (via MSPAddressAddRef, not AddRef) so that the aggregated address will not go away while the call is still alive, but TAPI 3.0's address is not AddRef'ed. | 
| MSP_HANDLE | *m_htCall | The handle to TAPI3's call. Used to fire call events. | 
| DWORD | m_dwMediaType | Bitmask of the media types on this call. | 
| CMSPArray <ITStream *> | m_Streams | The list of stream objects in the call. | 
| CMSPCritSection | m_lock | The lock that protects the stream lists. |