I'm actually referring to Windows Messenger which is different from MSN Messenger. Windows Messenger does not need to use Netmeeting's H323 capabilities for it to be able to do VOIP, Video, or White Board Services. Microsoft probably took these services from Netmeeting and build them into Windows Messenger so that they can be use via SIP. Windows Messenger uses SIP to establish the session between other SIP clients and opens up the channels for these types of services to be exchanged. These channels of service information can be proxy or exchange directly between each. But this is an entire other realm. It's an alternative to H323. As to which one you use, depends what you're trying to accomplish and what client protocols are being used. You are right, you would need to have some type of converter between h323 and sip if you have customer's already using Netmeeting and Windows messenger and you're using some type of centralize routing for these endpoints. But Peer to Peer works for both with out conversion. http://www.microsoft.com/technet/prodtechnol/winxppro/maintain/wmsgrfaq. mspx -----Original Message----- From: openh323gk-users-admin@xxxxxxxxxxxxxxxxxxxxx [mailto:openh323gk-users-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Michael Kendall Sent: Wednesday, March 02, 2005 2:09 PM To: openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Subject: whiteboard in MSN Messenger uses netmeeting Freddy, Regarding your suggestion to try MSN Messenger because it uses SIP, which deals with firewalls a little better than h323 does. MSN Messenger seems to have many features that use SIP, and these features, such as instant messaging, do a good job of traversing firewalls. But the advanced features of MSN Messenger cannot traverse firewalls because these features, including voip, video, and whiteboard, are provided by simply having MSN Messenger call the old netmeeting program. And since netmeeting uses H323, it cannot traverse firewalls, at least not without gnugk. SER (Sip Express Router) from www.iptel.org is a SIP only tool and therefore cannot work with netmeeting, which uses H323 rather than SIP. If you feel sure that I am wrong about MSN Messenger relying upon netmeeting for its voip functionality, please let me know. If you are right and I am wrong, that would be very good news. Freddy Parra wrote: But if you like to look at other alternatives, you might want to also check out Windows Messenger which is based on SIP and has a white board. You can then download SER (Sip Express Router) from www.iptel.org website and have Windows Messenger work with it, which works very nicely since I've worked with it in the past. ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click _______________________________________________________ List: Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_id=8549 Homepage: http://www.gnugk.org/ ------------------------------------------------------- SF email is sponsored by - The IT Product Guide Read honest & candid reviews on hundreds of IT Products from real users. Discover which products truly live up to the hype. Start reading now. http://ads.osdn.com/?ad_ide95&alloc_id396&opÌk _______________________________________________________ List: Openh323gk-users@xxxxxxxxxxxxxxxxxxxxx Archive: http://sourceforge.net/mailarchive/forum.php?forum_id?49 Homepage: http://www.gnugk.org/