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NAT /Firewall Document
by Simon Horne 12 Mar '12

12 Mar '12

Guys Apologies for cross posting Over the last couple of months Jan and I have been committing a lot of H.460 NAT support into H323plus and GnuGk . H.460.18/.19, Multiplexing, Traversal Zones and H.460.23/.24/.24A/.24B and just recently H.460.17. I have written with Jan's assistance an ordinary person guide to NAT, the types of NAT and the logic behind H.323 NAT Traversal solutions. It briefly explains exactly what all these standards mean and how they fit together to provide a complete NAT Traversal solution. h323_nat_fw_solution.pdf <http://hive.packetizer.com/users/h323forum/specifications/h323_nat_fw_solut ion.pdf> Simon

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Minor issues with upnp
by J.C Mercier 05 Feb '12

05 Feb '12

Hi all, If i may first note, I've compiled the latest h323plus with no problem, but when i go to compile the simpleplus program, it gives an unresolved error for H46019UDPSocket::GetPeerAddress(...). This happens because H323_H46024A and H323_H46024B are disabled and GetPeerAddress is defined within H323_H46024A but declared within H323_H46019M. I did a minor work around and it now compiles fine. Another issue I came upon, when I initialize UPNP during the h323 initialization, during the UPnPThread::TestMapping() function call, it manages to map both ports (11000 and 11001) but after calling RemoveMap(extPort,true); and RemoveMap(extPort+1,true), only 11001 is removed and not 11000. I tested this with different port range and it produces the same results (one unmapped and not the other). Is this supposed to be the case or is something wrong somewhere? Although, after closing the program, both ports are unmapped successfully. But another problem that happens every time I close the program is a memory access violation at; ~IxNATNumberOfEntriesCallback() { delete m_pointer; } from interface IxNATNumberOfEntriesCallback : public INATNumberOfEntriesCallback Any reason why this could be the case? Lastly, when upnp is initialized, making a call doesn't seem to open and map the ports at all. What else should be done aside from initializing upnp? Your help and suggestions will be greatly appreciated. Thanks Josh

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H323plus and ptlib 64 bits
by Y030052 Ng 03 Feb '12

03 Feb '12

Hello, Is it possible to compile H323plus and Ptlib in 64 bits under Windows 7 and Visual Studio 2010? Can someone guide me on this? Thank you. Best regards,Jess

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H.323 p2p media
by J.C Mercier 26 Dec '11

26 Dec '11

Hi all, Just curious to know if ICE NAT traversal metrology can also be implemented to help H.323, or is there any alternate approach as a work in progress for P2P media without requiring the use of a gatekeeper? Any info or other possibilities/approach will be greatly appreciated Thanks Josh

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Multiplexing support in H323plus
by J.C Mercier 14 Dec '11

14 Dec '11

Hi all, looking through the h323plus code, I noticed it supports multiplexing for H.460.19. Just a few questions; 1. Does H323plus also support RTP multiplexing without the need for h.460.19 (direct endpoint to endpoint)? 2. If it doesn't support endpoint to endpoint multiplexing, does limiting RTP ports to only a few ports such as 10 to 12 (i.e. 3000 - 3010) opened port always remain in that range or will this produce any side affects when making a lot of calls? 3. With multiplexing support for H.460.19, is it 2 ports; 1 bi-directional port for audio and 1 bi-directional port for video? is there a third port for RTCP (QoS)? 4. Is sending/receiving RTCP/QoS mandatory for H.323 systems? What affects are there if this is not enabled? Thanks for all your help Josh

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Rearranged Default Session IDs
by J.C Mercier 13 Dec '11

13 Dec '11

Hi all, Just wanted to confirm whether both DefaultDataSessionID and DefaultH224SessionID are to use the same value '3' as indicated in mediafmt.h as well as in rtp.h or is this a typo? enum { NonRTPSessionID = 0, FirstSessionID = 1, DefaultAudioSessionID = 1, DefaultVideoSessionID = 2, DefaultDataSessionID = 3, DefaultH224SessionID = 3, DefaultExtVideoSessionID = 4, DefaultFileSessionID = 5, LastSessionID = 5 }; Thanks Josh

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looking for h323plus T.120 sample application
by Ashwani Kumar 12 Dec '11

12 Dec '11

Hi All, Is there any "h323plus T.120" sample application available ? -- Regards. *Ashwani Kumar *

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video plugins and ffmpeg
by Ben Dudley 08 Dec '11

08 Dec '11

Hello all, I'm trying to compile OpenAM and use the plugins from the plugins dir of h323plus. I've downloaded the latest ptlib, h323plus core and applications from http://www.h323plus.org/source/. I started with a virgin install of Ubuntu 10.04 and installed dependent libs as necessary. Which version of ffmpeg works best with the plugins? apt-get retrieves ffmpeg 0.5.1. everything compiles fine and when I point PWLIBPLUGINDIR to OPENH323DIR/plugins openam lists all the codecs I expect to see - including H263. However, when I connect my video endpoint to it the video is freezes on what appears to be the first frame. I've tried later versions of ffmpeg from ffmpeg.org and libav from libav.org (recompiling h323plus, the plugins and openam after each ffmpeg change) but then openam doesn't list H263 in its list of codecs - only H261. The configure script indicates libavcodec and h263 is available for every combination I've tried. So, what's the secret to building openam with the H263 codecs? What version of ffmpeg must I use? Any help is greatly appreciated! PS: my apologies for first accidentally sending this to open323gk-users. Thanks! -Ben

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H.323 video codec support
by J.C Mercier 05 Dec '11

05 Dec '11

Hi all, I just have a question to know if H.323 is capable of supporting additional codecs such as THEORA (based on VP3) or VP8? If so, is h323plus capable of supporting such implementations or does H.323 only restricts video codecs to the H.26x class? Your insight on how this can be accomplished or what the requirements are will be appreciated. Thanks Josh

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Removing H.263/H.264 Capabilities in OpenMCU
by Victor Zanozin 30 Nov '11

30 Nov '11

Hi guys, I'm getting stuck with OpenMCU loading, and only starting the H.261 codecs. It seems it can detect H.263/H.264, but removes them shortly after detection, and then only shows one set of codecs in the video section of the startup. Logs: 0:00.030 OpenMCU H323 Found capability: H.239 Capabilities <18> H.263{sw} <1> 0:00.030 OpenMCU H323 Removing capability: H.239 Capabilities <18> H.263{sw} <1> 0:00.030 OpenMCU H323 FindCapability: "H.239 Capabilities" 0:00.030 OpenMCU H323 FindCapability: "*-QCIF*" 0:00.030 OpenMCU H323 Found capability: H.261-QCIF{sw} <14> 0:00.030 OpenMCU H323 Removing capability: H.261-QCIF{sw} <14> 0:00.030 OpenMCU H323 FindCapability: "*-QCIF*" 0:00.030 OpenMCU H323 FindCapability: "*-SQCIF*" 0:00.030 OpenMCU H323 FindCapability: "H.261{sw}" 0:00.030 OpenMCU H323 Found capability: H.261{sw} <15> 0:00.030 OpenMCU H323 Removing capability: H.261{sw} <15> 0:00.030 OpenMCU H323 FindCapability: "H.261{sw}" 0:00.030 OpenMCU H323 FindCapability: "H.263{sw}" 0:00.030 OpenMCU H323 Found capability: H.263{sw} <16> 0:00.030 OpenMCU H323 Removing capability: H.263{sw} <16> 0:00.030 OpenMCU H323 FindCapability: "H.263{sw}" 0:00.030 OpenMCU H323 FindCapability: "H.264{sw}" 0:00.031 OpenMCU H323 Found capability: H.264{sw} <17> 0:00.031 OpenMCU H323 Removing capability: H.264{sw} <17> Codecs loaded: 1: H.261-CIF{sw} <13> I'm also seeing no split screen video - When new endpoints join, video on the first endpoint freezes, and the new endpoint is not displayed until either endpoint disconnects, then it switches back to whichever endpoint is still connected and video resumes. Can anyone help? Thanks! Victor

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