- h323plus - lists.packetizer.com

回复： dtmf
by Bian 10 Jun '08

10 Jun '08

Thank you. Some H.323 endpoint use in-band signalings method such as NetMeeting, while other endpoint such as Polycom PVX use rfc2833 to transfer DTMF. But I don't know how get DTMF info from PVX's audio RTP packets. The code rfc2833.cxx in h323plus seems can not work with PVX. Hello bian the uso of tones, and other in-band signalings depends of the CODEC support, u must read the documentation about the codec u are using if suport in-band signaling. for example G.729 dont suport in-band tones and fax. tip: http://en.wikipedia.org/wiki/G.711 (at botton of page are the others G7xx.x) ___________________________________________________________ 雅虎邮箱，您的终生邮箱！ http://cn.mail.yahoo.com/

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dtmf
by Bian 09 Jun '08

09 Jun '08

hello, Anybody know how rfc2833(DTMF) is used in H.323 system? I have read source code of rfc2833.cxx in h323plus. But it seems that it can not interoperate with PVX. regards. bian ___________________________________________________________ 雅虎邮箱，您的终生邮箱！ http://cn.mail.yahoo.com/

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Crash in Ptlib...........
by mohammad alam 07 Jun '08

07 Jun '08

Simon, Robert I am not using H323Connection::OnSendCapabilitySet() Robert, As you suggested I go through my code many times and have taken great care of pointers. I tried to debug the library and I find the reason for PTlib crash. I am not sure.but It solved the problem for me In file h323caps.cxx Line no . 2064 BOOL H323CodecExtendedVideoCapability::OnSendingPDU(H245_VideoCapability & pdu) const { . . . . 1 if (table.GetSize() > 0) { 2 caps.SetSize(table.GetSize()); 3 for (PINDEX i=0; i< table.GetSize(); i++) { 4 H245_VideoCapability vidcap; 5 ((H323VideoCapability &)table[i]).OnSendingPDU(vidcap); 6 caps[i] = vidcap; 7 } 8 } else { 9 caps.SetSize(extCapabilities.GetSize()); 10 for (PINDEX i=0; i< extCapabilities.GetSize(); i++) { 11 H245_VideoCapability vidcap; 12 ((H323VideoCapability &)extCapabilities[i]).OnSendingPDU(vidcap); 13 caps[i] = vidcap; 14 } 15 } Here in line no. 1 if (table.GetSize() > 0) { table.GetSize() does not get initialsed after the end of the call table.GetSize() increases in order 0, 2, 4, 16, 32, 64, 128, 256 and crash........ I am not using Extended channel. But by default plugins add H.263 extended capabilities. How to avoid this?? Where is the problem?? Alam

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Crash in Ptlib...........
by mohammad alam 30 May '08

30 May '08

Simon After 8-10th times of placing and ending call (without restarting application) my Application crashes in ptlib in file asner.cxx at line 2079 (Below at line no.6 for your reference) Crashes are at both Local and Remote side on same line 1 PASN_Choice & PASN_Choice::operator=(const PASN_Choice & other) 2 { 3 if (&other == this) // Assigning to ourself, just do nothing. 4 return *this; 5 6 if(choice!=NULL) 7 { 8 delete choice; 9 choice = NULL; 10 } 11 12 PASN_Object::operator=(other); 13 14 numChoices = other.numChoices; 15 names = other.names; 16 namesCount = other.namesCount; 17 18 if (other.CheckCreate()) 19 choice = (PASN_Object *)other.choice->Clone(); 20 else 21 choice = NULL; 22 23 return *this; 24 } I am using this in my Loadcapabilities function for H.263 CIF Image Size capabilities.RemoveAll(); //called only once AddAllCapabilities(0, 0, "*"); //called only once AddAllUserInputCapabilities(0, 1); //called only once preferenceorder.AppendString(H263_CIF); preferenceorder.AppendString(H263_QCIF); preferenceorder.AppendString(H263_4CIF); preferenceorder.AppendString(H263_16CIF); preferenceorder.AppendString(H261_CIF); preferenceorder.AppendString(H261_QCIF); SetVideoFrameSize(H323Capability::cifMPI); capabilities.Reorder(preferenceorder); The last few lines of PTRACE are 2:26.027 H225 Calle...er:22641e8 H225 Handling PDU: Connect callRef=11394 2:26.027 H225 Calle...er:22641e8 H225 Set protocol version to 6 and implying H.245 version 13 2:26.027 H225 Calle...er:22641e8 H225 Set remote party name: "admin" 2:26.027 H225 Calle...er:22641e8 H225 Set remote application name: " VCS 1.0.0 (H323plus v1.20beta3) 9/61" 2:26.027 H225 Calle...er:22641e8 H225 Received connect PDU. 2:26.027 H225 Calle...er:22641e8 H323TCP Connecting to 10.8.4.144:1412 (local port=0) 2:26.038 H225 Calle...er:22641e8 H323TCP SetOption(IP_TOS) failed: Invalid argument 2:26.038 H225 Calle...er:22641e8 H323TCP Started connection: host=10.8.4.144:1412, if=10.8.4.148:2717, handle=1280 2:26.038 H225 Calle...er:22641e8 H225 Fast Start FALSE fastStartState FastStartDisabled 2:26.038 H225 Calle...er:22641e8 H245 Handle control channel 2:26.038 H225 Calle...er:22641e8 H245 Start control negotiations 2:26.038 H225 Calle...er:22641e8 H245 Sending TerminalCapabilitySet: outSeq=1 2:26.038 H245:6f3ff60 H245 Started thread 2:26.038 H245:6f3ff60 H245 Handle control channel 2:26.038 H245:6f3ff60 H245 Start control negotiations CRASH..>>>>>>>>>>>>>>>>>>>>>> This crash is consistent. Crashes anytime after 5th call.. Your comments are needed. Where I am going wrong..... Alam Regards Mohammad Alam

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Ptlib unix assert patch
by Nir Soffer 27 May '08

27 May '08

I tried to compile ptlib 2.0.1 on Ubuntu 7.10 and 8.0.4 but got compile errors. Attached a patch to make it compile. Is this really the stable version? Best regards, Nir Soffer

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Ptlib unix config permissions patch
by Nir Soffer 22 May '08

22 May '08

I found 2 related bugs in Ptlib unix. 1. PFile::SetPermission ignore group and other read permission in the permission parameter When you call SetPermission(path, 0600), the function apply instead 0644. The patch fix the issue by not adding group and other read permission if not set by the caller. 2. PXConfig::WriteToFile change config file owner, group and permissions The function try to perform atomic write by writing to a ".new" file, then renaming the ".new" file to the old file. The new file is created with the current user and group, using the default hardcoded permissions. The patch fix the permissions change by copying the permissions from the old file. The patch does not fix the user and group change.

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Master/Slave and SessionIDs
by Niek Kooij 19 May '08

19 May '08

Hi, I am trying to get the h224/h281 data channel to work with Tandberg equipment and ran into some problems. It turns out this has to do with sessionId's. The current implementation lets the connection/endpoint create an h281handler which will handle both in- and outgoing h224 RTP. The problem is that my H323Endpoint will usually begin with opening the logical channel and assigns DefaultH224SessionID = 4 as sessionID. Later on the Tandberg endpoint wants to open a channel but then with sessionId 3! This results in the construction of a new RTP_Session which will never be used (cause the h281handler is allready constructed and has its RTP_Session set). Can anybody tell me what the "right" way would be to solve this problem? Should the incoming and outgoing h224 channels have the same sessionID? My current solution is to change DefaultH224SessionID to 3 but this will probably result into problems when more data channels need to be openend... Thanks, Niek

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Problem transmitting different image sizes
by Abhishek Rohilla 12 May '08

12 May '08

Hi I have developed an application using H323Plus Library which allows a user to change to different codecs(H.261 & H.263) or different Image Sizes(QCIF, CIF, 4CIF & 16CIF) before making a call. Though, all the combinations(minus 16CIF) used to work well with OpenH323. The application somehow shows an unpredictable behaviour with H323Plus. By the term unpredictable I mean that using same code, same settings and same plugins, while one machine loads H.261 codec the other loads H.263. Sometimes the application would not even send the data to remote site(showing the frame rate of 0, probably coz of wrong negotiation or so). How can we put H.263 priority above H.261 for codec selection. We are using same code both sides but codec negotiation are different.We are using Reorder API of H323plus api. We have been investigating it thoroughly from past few days but in vain. So Please if anybody can throw light on this, it would be of great help. Thanks

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Re: [h323plus] RTP Stream without h.323?
by Patrice Peyrano 11 May '08

11 May '08

Many thanks. I will follow this track. Regard, Patrice.

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RTP Stream without h.323?
by Patrice Peyrano (Alias) 09 May '08

09 May '08

Hello, Can I use H323+ for managing only the RTP stream, with G711 or GSM decoding, without using H.323? In case of positive answer, could you explain to me the methodology or the way to process ? Many Thanks, Best regards. Patrice Peyrano

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