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