The SIP-T28P IP phone maintains call history lists of Dialed Calls, Received Calls, Missed Calls and Forwarded Calls. The call history lists support to store 100 entries in all. You can check the call history, dial a call, add a contact or delete an entry from the call history list. You should enable the history record feature in advance. 

To enable the history record feature via phone user interface: 

1. Press Menu->Features->History Setting
2. Press Left or Right , or the Switch soft key to select Enable from the History Record field. 

3. Press the Save soft key to accept the change or the Back soft key to cancel. 

To check the call history: 

1. Press the History soft key. 
The LCD screen displays All Calls list. 
2. Press Left or Right to switch between All Calls, Dialed Calls, Received Calls, Missed Calls and Forwarded Calls. 
3. Press Up or Down to select the desired entry. 
4. Press the Option soft key, and then select Detail from the prompt list. 
The detailed information of the entry appears on the LCD screen. 

To dial a call from the call history list: 

1. Press the History soft key. 
2. Press Left or Right to switch between All Calls, Dialed Calls, Received Calls, Missed Calls and Forwarded Calls. 
3. Press Up or Down to select the desired entry. 
4. Press the Send soft key. 

To add a contact from the call history list: 

1. Press the History soft key. 
2. Press Left or Right to switch between All Calls, Dialed Calls, Received Calls, Missed Calls and Forwarded Calls.
3. Press Up or Down to select the desired entry. 
4. Press the Option soft key, and then select Add to Contacts (or Add to Blacklist) from the prompt list. 
5. Enter the desired values in the corresponding fields. And then press the Save soft key. 

To delete an entry from the call history list: 

1. Press the History soft key. 
2. Press Left or Right to switch between All Calls, Dialed Calls, Received Calls, Missed Calls and Forwarded Calls. 
3. Press Up or Down to select the desired entry. 
4. Press the Delete soft key. 

To delete all entries from the call history list: 

1. Press the History soft key. 
2. Press Left or Right to switch between All Calls, Dialed Calls, Received Calls, Missed Calls and Forwarded Calls 
3. Press the Option soft key, and then select Delete All from the prompt list. 
4. Press the OK soft key. 
The LCD screen prompts "Delete all records?". 
5. Press the OK soft key to confirm the deleting or the Cancel soft key to cancel.