[asterisk-dev] Prodding channel H323

[Pavel Jezek]

hello,
can somebody explain the meaning of this warning messages, that 
sometimes appears in asterisk/messages log?
currently I'm using 1.2.5, I thing that before (1.2.1) this messages 
doesn't appear...
thanks
PJ

Mar 28 07:45:23 WARNING[22598] channel.c: Prodding channel 
'H323/ip$172.20.24.11:40955/25809' failed
Mar 28 07:46:46 WARNING[19457] channel.c: Prodding channel 
'H323/ip$172.20.24.11:39545/25818' failed
Mar 28 08:37:05 WARNING[10130] file.c: Failed to write frame
Mar 28 09:34:29 NOTICE[22661] chan_h323.c: Avoiding H.323 destory 
deadlock on ip$172.20.24.11:49983/25967
Mar 28 09:47:06 WARNING[5579] channel.c: Prodding channel 
'H323/ip$172.20.24.11:37597/25979' failed



my h323.conf is quite simple ;-)

[general]
port = 1720
bindaddr = 172.20.24.11
tos = 0x80
disallow=all
allow=g729
gatekeeper = DISCOVER
;noFastStart=yes

[ASTERISK]
type=h323
prefix=81,82