I'm testing telepathy spec now,so i've written a test program in Qt4
to use telepathy-qt of tapioca.

I've encountered problem in telepathy-stream-engine when connecting to
a gtalk client,the audio is one way from gtalk to telepathy,but gtalk
can't hear the sound from telepathy.

the same problem occur when i use call.py from telepathy-python.

Let me describe the situation in more detail now:
I have two machines, let's call them gentoo and windows.
gentoo has 2 network interfaces: eth0 - 192.168.0.1, ppp0 -
121.34.118.194, it acts as router of my home network, it use Gentoo
Linux and telepathy that I compiled from darcs repository.
windows has 1 network interface only: eth0 - 192.168.0.20. it use
Windows XP Professional and Gtalk.

No matter who initiat the talk,the sound from windows(gtalk) can be
heard on gentoo(telepathy), but the sound from gentoo(telepathy) can't
be heard on windows(gtalk).

That's the problem.

Here I attach the related log file for your reference.
1. test.cpp, test.h - the Qt4 test program
2. test_flow.log - the debug message of the test program
3. telepathy-stream-engine.log - the log message of telepathy-stream-engine
4. telepathy-wireshark.log - the captured packets of wireshark on gentoo
5. gtalk-wireshark.log - the captured packets of wireshark on windows