Voicemail System using SIPRTSP

1
Voice-mail System using SIP/RTSP

• Agenda
• Introduction
• Architecture
• Issues
• Implementation features
• Future plan
• Demo

2
Answering machine and voice mail
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
Voice mail
Operation
RTP
v-mail
vm.cs
Once the call is closed by user1, v-mail sends
an email to kns10 informing the arrival of a
voice mail
After 10 seconds v-mail contacts the RTSP server
for recording.
Kns10 can listen to voice mail using either a
RTSP client like quicktime or ...
rtspd
Now user message gets recorded
Sipd forks the request to kns10s phone and
voicemail.
V-mail accepts the call.
Sipd cancels the other branch and ...
...accepts the call from user1.
User1 calls kns10_at_cs through sipd.
...by calling the v-mail kns10-voicemail_at_vm.
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., ephone) or
  web page.
• Deletion using SIP user agent (e.g.,
  sipkns10--delete_at_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.