On the left section of the soft phone dial pad, you can see a history of all inbound, outbound and missed calls and they are filtered under 4 tabs:
1- All calls: Here the agent can see all inbound, outbound and missed calls.
2- Inbound calls
: Here the agent can see his/her inbound calls only.
3- Outbound calls 
: Here the agent can see his/her outbound calls only.
4- Missed calls 
: Here the agent can see his/her missed calls only. Missed calls are those calls which were missed by the agent and he/she didn’t answer a customer’s call.
Also you can check the call history by clicking on Calls section then filter your search based on date, customer number, directions or call ID.