1. Agenda Introduction Architecture Issues Implementation features Future plan Demo

2. Answering machine and voice mail User1 9397063 Kns10 853-8192 Dial 853-8192 Phone is ringing.. The person is not available now please leave a message...... Your voice message... Disconnect kns10 can listen to his mails by dialing some special sequence...

3. Current Technologies Voice mail system with PBX or phone Voice attachments to emails RTSP based media storage SIP for telephony Use SIP for accepting voice calls and RTSP for storage and access of voice messages.

4. v-mail rtspd INVITE kns10@cs user1 INVITE kns10@sip1 INVITE kns10@vm vm.cs; 200 OK CANCEL SETUP RTP/RTCP Email to kns10 Quick-time RTSP INVITE kns10-5261-voicemail SETUP/PLAY RTP sip1.cs; Kns10 User1 calls kns10@cs through sipd. Sipd forks the request to kns10’s phone and voicemail. After 10 seconds v-mail contacts the RTSP server for recording. V-mail accepts the call. Sipd cancels the other branch and......accepts the call from user1. Now user message gets recorded Once the call is closed by user1, v-mail sends an email to kns10 informing the arrival of a voice mail Kns10 can listen to voice mail using either a RTSP client like quicktime or......by calling the v-mail “kns10-voicemail@vm”. Operation REGISTER kns10@

5. Voice mail operation Various ways to use the service: Your phone redirects the call to voice mail after 10 seconds The SIP server is configured to forward the call to voice mail if your phone is busy or there is no response Voice mail server acts as another phone for the user but delays accepting the call by 10 seconds

6. Issues Call reclaiming Integration with PSTN phone Integration with voice profile for internet messaging Others ?

7. Features Recording and playback using.au (G.711 Mu Law) files. Retrieval of voicemail using RTSP client ( e.g., quicktime ) or SIP user agent ( e.g., e*phone ) or web page. Deletion using SIP user agent ( e.g., sip:kns10-#- delete@cs.columbia.edu ) or from web page.

8. Features Integration with web/email for more control over voicemail configuration ( e.g., folder management, email notification. ) Web based voice mail accounts for users ( Similar to Hotmail)

9. Future DTMF based navigation Support for other formats in “rtspd” Deployment Multimedia mail

10. Future Unified messaging - integration of voice mail/answering machine, email, instant messaging.