[Asterisk-video] Problem with h324/H223 handshake

[Klaus Darilion]

Hi!

I'm currently testing H324M video calls with chan_ss7 (incoming). Mostly 
it works, but sometimes (20%) the handshake fails - h324m_gw_answer() 
does not return (I guess this is H.223 handshake, or is it already H.245?).

If I take a look at the h223_in_....raw files from a good and a bad 
attempt, the look similar - no obvious difference - they start with the 
same pattern:

0000000 abab abab abab abab abab abab abab abab
*
0000af0 abab abab abab abab abab ffab ffff ffff
0000b00 ffff ffff ffff ffff ffff ffff ffff ffff
*
0002d90 ffff ffff 4de1 0000 e100 004d 0000 4de1
0002da0 0000 e100 004d 0000 4de1 0000 e100 004d
0002db0 0000 4de1 0000 e100 004d 0000 4de1 0000
0002dc0 e100 004d 0000 4de1 0000 e100 004d 0000
0002dd0 4de1 0000 e100 004d 0000 4de1 0000 e100
0002de0 004d 0000 4de1 0000 e100 004d 0000 4de1
0002df0 0000 e100 004d 0000 4de1 0000 e100 004d
0002e00 0000 4de1 0000 e100 004d 0000 4de1 0000

Any hints how to debug this?

thanks
klaus