1. Architecture SIP proxy, redirect server SQL database sipd Proxy, Redirect, Registration server. Authentication Programmable (SIP- CGI) OpenSource SQL database: MySQL http://www.mysql.com User information: Contact location Profile (e.g., password) Aliases Conferences Address book System information Configuration

2. Architecture SIP proxy, redirect server SQL database sipd Web based configuration Web server User profile can be modified using web browser. Creating new user (admin/normal) Changing profile and contact information (“follow me” service). Web CGI scripts Both sipd and web scripts use the database

3. Architecture SIP proxy, redirect server SQL database sipd e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Web based configuration Web server IP phones connected to the departmental LAN. Users are identified by id, e.g., “hgs@cs.columbia.edu” Software (sipc) for desktop. Allows audio, video, chat, white board, device control, instant message, presence and desktop sharing. Also plugnsip.

4. Architecture SIP proxy, redirect server SQL database sipd e*phone sipc Software SIP user agents Hardware Internet (SIP) Phones 128.59.19.233 Web based configuration Web server Phones register themselves with sipd when powered up. Sipd stores the contact information in the database table: hgs@cs.columbia.edu => hgs@128.59.19.233 There can be multiple contacts. All registered phones ring, and the first to pick up is connected. Regsitration can also be altered from the web interface

5. Architecture SIP proxy, redirect server SQL database sipd e*phone sipc Software SIP user agents Hardware Internet (SIP) Phones 128.59.19.233 Web based configuration Web server (2) Phone rings, the user picks up the call and can talk to the caller. (1) When somebody calls hgs@cs.columbia.edu, sipd gets the INVITE message and forwards the call to the current location. Another IP phone Based on user profile, sipd may ask for caller authentication.

6. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Cisco 2600 router with SIP/PSTN gateway connects the departmental LAN with the PBX. Departmental PBX (Nortel Meridian) connects both internal and external lines to the gateway. Telephone switch Internal T1/CAS External T1/CAS (Extension:713x) Dial “8” to reach outside line

7. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server (2) The gateway forwards all PSTN calls to sipd; sip:7132@128.59.19.141 (1) When PBX receives a call for 9397132, it forwards the call to extension 7132. 7130-7139 is assigned to the gateway. Telephone switch Internal T1/CAS (Extension:713x) Dials 9397132 128.59.19.141 (3) Sipd looks into the dialplan, finds a mapping 7132=>hgs@cs.columbia.edu and forwards the call to the current location of “hgs”.

8. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway 128.59.19.28 Department PBX Web based configuration Web server (2) Sipd authenticates the caller and checks permissions. Sipd maps the number 5551212 to 85551212@128.59.19.28, adding the prefix “8” and the gateway address. (3) PBX forwards the call to external line. Telephone switch 128.59.19.141 (1) The IP user dials “sip:5551212@cs.columbia.edu”. Dial “8” to reach outside line External T1/CAS (4) PSTN user receives the call.

9. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Can use no-DID (direct inward dialing) mode for more numbers. Telephone number mappings and privileges modifiable from the web Telephone switch Internal T1/CAS External T1/CAS

10. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server SNMP agent for SIP MIB. Allows remote monitoring and control of the SIP server. (e.g., prompt when an unauthorized registration is attempted) Telephone switch SNMP (Network Management)

11. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Telephone switch SNMP (Network Management) SIPH.323 convertor NetMeeting siph323 H.323 Allows an H323 client (Netmeeting) to use the services of our SIP infrastructure.

12. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Telephone switch SNMP (Network Management) SIPH.323 convertor NetMeeting siph323 H.323 Provides a voice mail and answering machine service to all the registered users. Has web interface for accessing voice mails. rtspd SIP/RTSP Unified messaging RTSP media server sipum Quicktime RTSP clients RTSP Generic media server for playback and recording of messages. Can work with existing RTSP client, Apple’s QuickTime.

13. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Telephone switch SNMP (Network Management) SIPH.323 convertor NetMeeting siph323 H.323 rtspd SIP/RTSP Unified messaging RTSP media server sipum Quicktime RTSP clients RTSP Centralized conferencing server for audio and video. Users can join from IP as well as PSTN. SIP conference server sipconf

14. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Telephone switch SNMP (Network Management) SIPH.323 convertor NetMeeting siph323 H.323 rtspd SIP/RTSP Unified messaging RTSP media server sipum Quicktime RTSP clients RTSP Netmeeting user dials “sip:meeting@cs.columbia.edu” SIP conference server sipconf SIP user dials “sip:meeting@cs.columbia.edu” PSTN user dials 1-212-9397139 Sipd maps 7139=> meeting@128.59.19.196 128.59.19.196

15. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Telephone switch SNMP (Network Management) SIPH.323 convertor NetMeeting siph323 H.323 rtspd SIP/RTSP Unified messaging RTSP media server sipum Quicktime RTSP clients RTSP SIP conference server sipconf Device gateway allows control of X10 devices. We can control a “lamp” using SIP DO message. Device GW X 10

16. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Telephone switch SNMP (Network Management) SIPH.323 convertor NetMeeting siph323 H.323 rtspd SIP/RTSP Unified messaging RTSP media server sipum Quicktime RTSP clients RTSP SIP conference server sipconf Device GW X 10

17. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Telephone switch SNMP (Network Management) SIPH.323 convertor NetMeeting siph323 H.323 rtspd SIP/RTSP Unified messaging RTSP media server sipum Quicktime RTSP clients RTSP SIP conference server sipconf Device GW X 10 SIP based Voice XML browser to allow access to voice mail and other services from touch tone phones Performance measurement and scalability for very large call/session volumes (for sipd, sipconf and rtspd). Accounting and billing services Communication portal: Address book, calendar, message board, file sharing, conferencing, etc.

18. e*phone sipc Software SIP user agents Hardware Internet (SIP) phones Architecture SIP proxy, redirect server SQL database sipd T1/E1 RTP/SIP Telephone SIP/PSTN Gateway Department PBX Web based configuration Web server Telephone switch SNMP (Network Management) SIPH.323 convertor NetMeeting siph323 H.323 rtspd SIP/RTSP Unified messaging RTSP media server sipum Quicktime RTSP clients RTSP SIP conference server sipconf Device GW X 10 Single box

19. Architecture T1/E1 RTP/SIP Telephone External SIP/PSTN Gateway Telephone switch Single box All servers in a single box Connects to a PSTN/SIP gateway Users can use soft clients or hardware phones Web based configuration and management