Cisco Cisco Unified 7975G - Manual (Page 24)

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Select the Ring Type 12 Supported Supported
Switching an In-Progress Call to Another Phone Using SNR 20 Not Supported Supported
Transfer a Call 15 Supported Supported
Transfer to Voice Mail 16 Not Supported Supported
Use the Intercom Feature 20 Supported Supported
View Call History 20 Supported Supported
View Multiple Calls 15 Supported Supported
Whisper Intercom 12 Not Supported Supported
Table 1 Features (with page number references) supported in SIP and SCCP protocols.
Phone Features SIP SCCP