January 2008 - h323plus - lists.packetizer.com

H323_H224 Channel problem.
by mohammad alam 22 Jan '08

22 Jan '08

Hi Simon I am implementing FECC in my Application. The following code snippet of h323.cxx.opens H323_H224 channel only in one direction i.e in Transmit direction only. #ifdef H323_H224 if(h245_available && startH224) { if(remoteCapabilities.FindCapability("H.224") != NULL) { H323Capability * capability = localCapabilities.FindCapability("H.224 "); if(capability != NULL) { if(logicalChannels->Open(*capability, OpalMediaFormat::DefaultH224SessionID)) { H323Channel * channel = capability->CreateChannel(*this, H323Channel::IsTransmitter, OpalMediaFormat::DefaultH224SessionID, NULL); if(channel != NULL) { channel->SetNumber(logicalChannels->GetNextChannelNumber()); fastStartChannels.Append(channel); } } } } startH224 = FALSE; } #endif Receiver channel is not being open. How to open H323_H224 Receiver channel ? Pls help me.. Regards Alam

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Re: [h323plus] Dynamic Bandwidth Management!!
by Simon Horne 21 Jan '08

21 Jan '08

To all G722.2 (AMR-WB) implementation is available from VoiceAge (for windows) http://www.voiceage.com/openinit_amrwb.php If anyone has the time to do the audio plugin, the capability exchange is defined in H.245 Annex R This is on my to-do lists but contributions are most welcome Simon -----Original Message----- From: h323plus-bounces(a)lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com]On Behalf Of Robert Jongbloed Sent: Tuesday, January 22, 2008 7:23 AM To: h323plus(a)lists.packetizer.com Subject: Re: [h323plus] Dynamic Bandwidth Management!! The other possibility is that he is talking about "in call" bandwidth management, specifically the H.245 FlowControlCommand/FlowControlIndication messages which can be used to control the bandwidth of a specific codec. For audio it is not hugely useful unless you have something like GSM-AMR or G.722.2 (aka GSM-AMR wideband) which have a few bit rate options, but it can be really useful for video as most codecs have a wide range of bit rates. Both H323plus and OPAL have "bits and pieces" of support for this, but no one has ever really looked closely at it to give it a really good debug. At least no one out there that has admitted to it! L As another throw away comment: the rise in available bit rate will hopefully make wide band codecs such as Speex-wb and G.722.2 more popular. I 've used them in other environments and the quality is noticeably better, and as voice quality is one of the biggest complaints people have with VoIP, it can only help! Robert Jongbloed OPAL/OpenH323 Architect and Co-founder. From: h323plus-bounces(a)lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of Paul E. Jones Sent: Tuesday, 22 January 2008 1:00 AM To: Frank Fischer; h323plus(a)lists.packetizer.com Subject: Re: [h323plus] Dynamic Bandwidth Management!! Frank, Ah, OK. That makes sense. From an H.323 perspective, this kind of thing is almost doable, but no remote device would be obliged to make adjustments. One could send a Request Mode message and the receiver could politely refuse. (Likewise, a SIP device could refuse an offer to propose changes to established media flows.) The other issue is knowing whether or not bandwidth needs to be adjusted or can be adjusted. One might say that bandwidth could increase, because there is no observed packet loss. But, perhaps an increase in bandwidth might then disrupt some other service (e.g., other voice calls in progress). So, then perhaps the bandwidth might be decreased to compensate. This then leads one in a vicious cycle of bandwidth adjustments up and down. And, as you rightfully point out, available bandwidth is constantly rising and it will continue, since people want to utilize services that require more bandwidth and want to use even more services simultaneously. The 80Kbps voice call is really very little compared to the Gbps of bandwidth most broadband customers have today. Still, there are bandwidth-constrained locations, but the best recommendation I could make is to simply select a lower bit-rate codec and use that. Skype, for example, always uses G.729 for calls to PSTN gateways and the sound quality seems very good to me. Paul ----- Original Message ----- From: Frank Fischer To: h323plus(a)lists.packetizer.com Sent: Monday, January 21, 2008 8:42 AM Subject: Re: [h323plus] Dynamic Bandwidth Management!! Hi i think he means the abillity to dynamically change the codec during transmission to follow any changes in available bandwith. I.e. when starting with g.711 and the available bandwith drops to 80kbits then i.e. g.729 could be negotiated on the fly. Actually a very nice feature but probably not very easy to implement and more important, getting less and lesser important since bandwiths are constently increasing almost all over the world.... Frank -------------------------------------------------------------------------- From: h323plus-bounces(a)lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com] On Behalf Of Paul E. Jones Sent: Monday, January 21, 2008 2:33 PM To: Abhishek Rohilla; h323plus(a)lists.packetizer.com Subject: Re: [h323plus] Dynamic Bandwidth Management!! Abhishek, H.323 Plus aside, what do you mean by "dynamic bandwidth management"? Paul ----- Original Message ----- From: Abhishek Rohilla To: h323plus(a)lists.packetizer.com Sent: Monday, January 21, 2008 4:44 AM Subject: [h323plus] Dynamic Bandwidth Management!! Hi Someone please help me with this. I wanted to know does H323+ does dynamic bandwidth management and mange the codec bit rate accordingly? How is it done.?? Where can I find the code in RTP files in H323+ where bandwidth info is calculated? Thanks

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Dynamic Bandwidth Management!!
by Abhishek Rohilla 21 Jan '08

21 Jan '08

Hi Someone please help me with this. I wanted to know does H323+ does dynamic bandwidth management and mange the codec bit rate accordingly? How is it done.?? Where can I find the code in RTP files in H323+ where bandwidth info is calculated? Thanks

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DirectShow support (was Problem with Logitech camera)
by JF NP 18 Jan '08

18 Jan '08

Hi, I've downloaded the latest version of PTLib from SVN and in fact, in configure.ac there is a section about directshow. When I compile PTLib, configure detects DirectShow support and enabled it. But my problem is that when I try to compile Simple or MyPhone2 to make tests, both fail because they have an #include <ptlib/dshow.h>, and there is no such header file. What am I doing wrong? Where can I found that file? BR, ----- Mensaje original ---- De: Simon Horne <s.horne(a)packetizer.com> Para: JF NP <jfnp090274(a)yahoo.es> Enviado: martes, 15 de enero, 2008 23:06:55 Asunto: RE: [h323plus] Problem with Logitech camera DIV { MARGIN:0px;} Br Unless there is an section in configure.ac in your version of ptlib for diectshow I would not just define it. Let configure find it if both pwlib version supports it and it get detected. The original version of directshow was only for mingw however it has since been ported to VS and added to the configure.ac to autodetect support. ==================== Simon Horne email. s.horne(a)isvo.net Principal Maintainer h323plus Library Consulting and Contracting consulting(a)h323plus.org. ======================== -----Original Message---- From: h323plus-bounces(a)lists.packetizer.com [mailto:h323plus-bounces@lists.packetizer.com]On Behalf Of JF NP Sent: Wednesday, January 16, 2008 3:33 AM To: H323plus Subject: Re: [h323plus] Problem with Logitech camera Hi, Is it possible to have DirectShow enabled on native Windows simply by defining P_DIRECTSHOW in ptbuildopts.h? Is it necessary any other work? Br, ----- Mensaje original ---- De: Simon Horne <s.horne(a)packetizer.com> Para: JF NP <jfnp090274(a)yahoo.es> CC: H323plus <h323plus(a)lists.packetizer.com> Enviado: miércoles, 9 de enero, 2008 19:29:51 Asunto: RE: [h323plus] Problem with Logitech camera I will try and have stable release out within the next couple of weeks. Simon > -----Original Message----- > From: h323plus-bounces(a)lists.packetizer.com > [mailto:h323plus-bounces@lists.packetizer.com]On Behalf Of JF NP > Sent: Wednesday, January 09, 2008 11:35 PM > To: H323plus > Subject: Re: [h323plus] Problem with Logitech camera > > > Hi, Simon: > > Do you know when will the next version (with > DirectShow support) be released? > > BR, > > --- Simon Horne <s.horne(a)packetizer.com> escribió: > > > > > JP > > > > The problem is that not all windows webcams are > > supported with the existing > > VideoForWindows. Directshow fixes that unfortunately > > for pwlib 1.12 it is > > only available with mingw compilations for windows. > > I have checked a bit of > > work to allow it to be compiled with Visual Studio > > however that is in PTLib. > > Once we migrate to PTlib and release the stable > > version of h323plus the > > problem should be rectified. > > > > Simon > > > > > -----Original Message----- > > > From: h323plus-bounces(a)lists.packetizer.com > > > [mailto:h323plus-bounces@lists.packetizer.com]On > > Behalf Of JF NP > > > Sent: Wednesday, January 09, 2008 8:00 PM > > > To: h323plus(a)lists.packetizer.com > > > Subject: [h323plus] Problem with Logitech camera > > > > > > > > > Hi, > > > > > > I have a Logitech Communicate STX webcam, but I > > cannot > > > make it work with h323plus. I've attached a trace > > from > > > vidtest. Could anybody help me? > > > My computer runs Windows XP SP 2 (Spanish). > > > > > > Thanks in advance, > > > > > > > > > > > > ______________________________________________ > > > Web Revelación Yahoo! 2007: > > > Premio Favorita del Público. > > > > > > http://es.promotions.yahoo.com/revelacion2007/favoritos/ > > > > > > > > > ______________________________________________ > Web Revelación Yahoo! 2007: > Premio Favorita del Público. > http://es.promotions.yahoo.com/revelacion2007/favoritos/ Web Revelación Yahoo! 2007: Premio Favorita del Público - ¡Vota tu preferida! ______________________________________________ Web Revelación Yahoo! 2007: Premio Favorita del Público. http://es.promotions.yahoo.com/revelacion2007/favoritos/

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h460.18/19
by Niek Kooij 18 Jan '08

18 Jan '08

Hello, As Simon wrote on 2007-12-25 there is some NAT traversal code in h323plus. I was wondering if the real h460.18 and 19 are also on the list to be implemented. And if so what would be the timeline for this? Niek

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How to add a generic Video Capability?
by Abhishek Rohilla 17 Jan '08

17 Jan '08

Hi I have been able to build mpeg4 plugin code taken from opal cvs. Its PluginCodec Definition has defined it as type PluginCodec_H323Codec_nonStandard. I have changed it to PluginCodec_H323Codec_generic and compiled it. Should mpeg4 capability be added as generic or non-standard? What is the difference between two? My application is loading the dll perfectly fine now but the capabilities are not being added because of the following reasons: 1.) Generic and non-standard video capabilties require *h323CapabilityData(last member in PluginCodec_Definition) to point to generic capability data info. This has not been defined in opal plugin code. 2.) H323Capability *CreateGenericVideoCap() is checking for PluginCodec_H323GenericCodecData in **PluginCodec_Definition and it is null currently ,so capability is not created *Can someone help me in how to define generic capability data and what all information it needs? I have recognized the structures in opalplugins.h but don't know how to fill them with suitable values for mpeg4 plugin. Please help Thanks *** *

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Caller ID Problem
by Kirav Patel 17 Jan '08

17 Jan '08

Hi, We have built Open H.323 based application which can dial about 100 numbers paralleled. We are trying to configuring Caller ID so all dialed numbers can see Caller ID. And to set it, we are using 'AddAliasName' function. Now when application dials to all numbers, some numbers can see Caller ID, some can not see. This is a kind of random behavior we are facing. We are setting same 'Alias' for multiple H.323 Endpoints - We are creating multiple H.323Endpoints and get them register with GK. We are using GnuGK in proxy mode and Soft switch is ahead to that. Now we want to know is this giving us trouble or there is some other mechanism should set up in order to set customized 'Alias' (Caller ID) at Endpoint? Any help or suggestion will be appreciated. Thanks in Advance, Kirav Patel No virus found in this outgoing message. Checked by AVG. Version: 7.5.516 / Virus Database: 269.19.5/1228 - Release Date: 1/16/2008 9:01 AM

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Presence support in h323plus (and GnuGk)
by Simon Horne 15 Jan '08

15 Jan '08

Guys I have made the first submission to the ITU on presence and have now added the basic code support to h323plus. It is hoped to have the support for it in GnuGk 2.2.8 (one after next release) The ITU submission for a bit of light reading. :-) http://ftp3.itu.ch/av-arch/avc-site/2005-2008/0801_Seo/AVD-3293.zip Simon ==================== Simon Horne email. s.horne(a)isvo.net Principal Maintainer h323plus Library Consulting and Contracting consulting(a)h323plus.org. ========================

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Failed to set video capability in my video conference based on openh323
by 柳溟 15 Jan '08

15 Jan '08

Hi everybody, I am developing a video conference based on openh323, right now, I failed to set video capability in my system. I wrote a new class named HMH323_H261Capability, derived from H323_H261Capability. class HMH323_H261Capability : public H323_H261Capability { PCLASSINFO(HMH323_H261Capability, H323_H261Capability) public: HMH323_H261Capability(unsigned qcifMPI, unsigned cifMPI, BOOL temporalSpatialTradeOff=TRUE, BOOL stillImageTransmission=FALSE, unsigned maxBitRate=850); virtual PObject *Clone()const; virtual H323Codec *CreateCodec(H323Codec::Direction direction) const; }; When the program begin, I use SetCapability (0, 1, new HMH323_H261Capability (0, 1, TRUE, FALSE, 8192)); and the program runs OK, However, when I connect MCU by calling H323EndPoint::MakeCall(remoteParty, NULL, token, userData); the program throw exception and exit. Here is the call stack KERNEL32! 7c812a5b() MSVCRTD! _CxxThrowException@8 + 57 bytes MSVCRTD! __RTDynamicCast + 383 bytes H323Capability::Compare(const PObject & {...}) line 427 + 23 bytes PObject::operator==(const PObject & {...}) line 1452 + 22 bytes H323Capabilities::FindCapability(const H323Capability & {...}) line 2075 + 26 bytes H323Capabilities::Merge(const H323Capabilities & {...}) line 2375 + 21 bytes H323Connection::OnReceivedCapabilitySet(const H323Capabilities & {...}, const H245_MultiplexCapability * 0x013f2c44, H245_TerminalCapabilitySetReject & {...}) line 4315 + 18 bytes H245NegTerminalCapabilitySet::HandleIncoming(const H245_TerminalCapabilitySet & {...}) line 603 + 48 bytes H323Connection::OnH245Request(const H323ControlPDU & {...}) line 3784 + 18 bytes H323Connection::HandleControlPDU(const H323ControlPDU & {...}) line 3742 + 18 bytes H323Connection::HandleControlData(PPER_Stream & {...}) line 3726 + 18 bytes H323Connection::HandleControlChannel() line 3666 + 18 bytes H245TransportThread::Main() line 599 PTLIBD! PThread::MainFunction(void *) line 1168 _threadstartex(void * 0x013e8ce0) line 212 + 13 bytes KERNEL32! 7c80b683() In the H323Capability::Compare PObject::Comparison H323Capability::Compare(const PObject & obj) const { PAssert(PIsDescendant(&obj, H323Capability), PInvalidCast);-->Failed Can anyone tell me the problem?

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Re: [h323plus] Problem with Logitech camera
by JF NP 15 Jan '08

15 Jan '08

Hi, Is it possible to have DirectShow enabled on native Windows simply by defining P_DIRECTSHOW in ptbuildopts.h? Is it necessary any other work? Br, ----- Mensaje original ---- De: Simon Horne <s.horne(a)packetizer.com> Para: JF NP <jfnp090274(a)yahoo.es> CC: H323plus <h323plus(a)lists.packetizer.com> Enviado: miércoles, 9 de enero, 2008 19:29:51 Asunto: RE: [h323plus] Problem with Logitech camera I will try and have stable release out within the next couple of weeks. Simon > -----Original Message----- > From: h323plus-bounces(a)lists.packetizer.com > [mailto:h323plus-bounces@lists.packetizer.com]On Behalf Of JF NP > Sent: Wednesday, January 09, 2008 11:35 PM > To: H323plus > Subject: Re: [h323plus] Problem with Logitech camera > > > Hi, Simon: > > Do you know when will the next version (with > DirectShow support) be released? > > BR, > > --- Simon Horne <s.horne(a)packetizer.com> escribió: > > > > > JP > > > > The problem is that not all windows webcams are > > supported with the existing > > VideoForWindows. Directshow fixes that unfortunately > > for pwlib 1.12 it is > > only available with mingw compilations for windows. > > I have checked a bit of > > work to allow it to be compiled with Visual Studio > > however that is in PTLib. > > Once we migrate to PTlib and release the stable > > version of h323plus the > > problem should be rectified. > > > > Simon > > > > > -----Original Message----- > > > From: h323plus-bounces(a)lists.packetizer.com > > > [mailto:h323plus-bounces@lists.packetizer.com]On > > Behalf Of JF NP > > > Sent: Wednesday, January 09, 2008 8:00 PM > > > To: h323plus(a)lists.packetizer.com > > > Subject: [h323plus] Problem with Logitech camera > > > > > > > > > Hi, > > > > > > I have a Logitech Communicate STX webcam, but I > > cannot > > > make it work with h323plus. I've attached a trace > > from > > > vidtest. Could anybody help me? > > > My computer runs Windows XP SP 2 (Spanish). > > > > > > Thanks in advance, > > > > > > > > > > > > ______________________________________________ > > > Web Revelación Yahoo! 2007: > > > Premio Favorita del Público. > > > > > > http://es.promotions.yahoo.com/revelacion2007/favoritos/ > > > > > > > > > ______________________________________________ > Web Revelación Yahoo! 2007: > Premio Favorita del Público. > http://es.promotions.yahoo.com/revelacion2007/favoritos/ ______________________________________________ Web Revelación Yahoo! 2007: Premio Favorita del Público. http://es.promotions.yahoo.com/revelacion2007/favoritos/

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