Jajah Speaker: Yan-Shiang Wang Date:

2 Classic Caller Callee PBX PSTN Signaling Voice

3 Voice over IP CallerCallee VoIP Proxy Internet VoIP Proxy Internet Signaling Voice

4 Jajah Usage  Make a phone call through web-page  Caller picks up the phone  Callee picks up the phone Play a middleman role

5 User Interface

6 Flow chart PSTN CallerCallee Internet VoIP Proxy PBX Internet/PSTN Caller’s PC Internet Signaling Voice

7 Advantage Use original hard phone Use original phone number Conference call; Schedule call It is honest that steals nothing on user’s computer The only restriction is caller needs to use computer at initial of call  Solution: use smartphone

8 Disadvantage This is not inherently free for charge

9 Reference