1. Open H323 Features, tools and basic utilization Liane Tarouco Leandro Bertholdo

2. Open H323 – Project n It appeared from 1998 trying to solve the problem of the high cost of licenses for commercial implementation of the protocol. These costs was hindering its development and use in the community of the Internet.

3. Open H323 – Project n The OpenH323 project aims to create a full featured, interoperable, Open Source implementation of the ITU-T H.323 teleconferencing protocol that can be used by personal developers and commercial users without charge

4. Open H323 - Project n Developed in C++ n Ported to several operational systems like Windows, FreeBSD, Solaris and Linux (Redhat, Debian, Fedora, etc.). n Several tools implemented are available in http://www.openh323.org. http://www.openh323.org n Spanish tutorial at http://toncar.cz/openh323/tut/sp/files.html

5. OpenH323 x H323 In terms of concepts and functionalities, does not exist significant difference in protocols implementations. Implementation uses the same standards that base the H323, as well as terminals, gatekeepers, and control units multipoint (MCUs). The hierarchy of class of the OpenH323 can be reached in http://www.openh323.org/docs/OpenH323/HIER.html http://www.openh323.org/docs/OpenH323/HIER.html

6. Open H323 Tools Several tools are ready to run: OhPhone H.323 interactive line command client. Supports audio and video; no shared whiteboard, file transfer, or shared applications. OpenAM: H.323 answering machine. Plays back a recorded message and records incoming audio. No video support at present. Forwarder: Forwards H.323 sessions from one IP address/port to another. Used to serve multiple H.323 destinations from a single IP address.

7. Open H323 Tools OpenMCU: Multipoint Control Unit. Connects multiple sessions together into a conference call (Videoconference Server). PSTNGw: Allows NetMeeting clients to make phone calls onto the conventional phone system - the Public Switched Telephone Network (PSTN). Requires special hardware. OpenIVRH: H323 Interactive Voice Response OpenGK H.323 gatekeeper CallGen323: H.323 call generator GnomeMeeting: Same as microsoft Netmeeting without full T.120 protocol.

8. Installing OpenMCU n OpenMCU package was tested on FreeBSD and Linux (Fedora and Debian) n FreeBSD instalation is very easy: # pkg_add –r openh323 # pkg_add –r openmcu # make install # /usr/local/bin/openmcu –n -v NOTE: If you are using FreeBSD 5.x, you have to install a compat4x package before.

9. OpenMCU Features n OpenMCU has features like –Audio codec G.711, GSM MS-GSM e LPC-10 –Video codec H.261 –Can accept multiples connections simultaneously –Several different conferences can be talking place at the same time using “room” feature. –display statistics on call in progress

10. OpenMCU Features –You can do a loopback audio to test your signal quality –You can permit/force/disable gatekeeper utilization –You can trace all calls –Support until four (4) videos at the same time. You can hear another people but only four can send a video signal.

11. Testing OpenMCU with Netmeeting Netmeeting and Gnomemeeting interfaces.

12. OpenMCU Logs Waiting for incoming calls for "OpenH323 MCU v1.1.7" Command ? Opening connection Accepting call from Leandro Bertholdo [192.168.1.11] using Microsoft NetMeeting /3.0 with room id room101 Member ip$192.168.1.11:2422/25581 will not hear their own voice Started logical channel: sending G.711-uLaw-64k{sw} Started logical channel: sending H.261-QCIF Started logical channel: receiving G.711-uLaw-64k{sw} Opening connection Incoming H.323 call from Linux Bertholdo [192.168.1.17] has not selected a room. Using room room101 as the default. Accepting call from Linux Bertholdo [192.168.1.17] using gnomemeeting/1.2.1 (OpenH323 v1.15.3) with room id room101