asterisk users - Jul 2011 - Can't get video on one server of 4

Hi,

we have 4 asterisk, versions are 1.4.35 1.4.36 1.6.2.18 and 1.4.42 One 
GrandStream GXV3000 is used for the tests. He is registered to asterisk 
1.6.2.18 asa well as 1.4.35. Calling echo test is OK on both servers, 
get audio and video. Calling echo test from asterisk 1.4.36 bye a SIP 
trunk from both others servers is also working well.

What fail, is video on echo test from asterisk 1.4.42 using SIP trunks: 
we have audio but no videobeside the fact that video codec are 
negociated as shown below.

All servers are on public IP. Here is a debug from a call from server 
running 1.4.35 asterisk to the 1.4.42 one:

<------------->
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: --- (14 headers 18 lines) 
---
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Sending to 
XXX.XXX.XXX.XXX : 5060 (no NAT)
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Using INVITE request as 
basis request - 78938c042d374b341c4f1b60071d319f at XXX.XXX.XXX.XXX
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found peer 'mypeer'
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found RTP audio format 0
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found RTP audio format 3
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found RTP audio format 101
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found audio description 
format PCMU for ID 0
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found audio description 
format GSM for ID 3
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found audio description 
format telephone-event for ID 101
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found RTP video format 34
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found RTP video format 103
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found RTP video format 99
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found video description 
format H263 for ID 34
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found video description 
format h263-1998 for ID 103
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Found video description 
format H264 for ID 99
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Capabilities: us - 
0x3c0002 (gsm|h261|h263|h263p|h264), peer - audio=0x380006 
(gsm|ulaw|h263|h263p|h264)/video=0x380000 (h263|h263p|h264), combined - 
0x380002 (gsm|h263|h263p|h264)
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Non-codec capabilities 
(dtmf): us - 0x1 (telephone-event), peer - 0x1 (telephone-event), 
combined - 0x1 (telephone-event)
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Peer audio RTP is at port 
XXX.XXX.XXX.XXX:40428
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Peer video RTP is at port 
XXX.XXX.XXX.XXX:44636
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: Looking for 3800 in 
acces_groupe (domain mydomain.com)
[2011-07-05 16:08:14] VERBOSE[11535] logger.c: list_route: hop: 
<sip:353 at XXX.XXX.XXX.XXX>
[2011-07-05 16:08:14] VERBOSE[11535] logger.c:
<--- Transmitting (NAT) to XXX.XXX.XXX.XXX:5060 --->

All trunks. are setted from the same manier:

[trunk]
;
type=peer
deny=0.0.0.0/0.0.0.0
permit=XXX.XXX.XXX.XXX
host=host.domain.com
context=from-trunk
disallow=all
allow=all

A "sip show peer <mypeer>" show that video is on.

What can be the problem, I start loose my hairs!

Thanks for any hint.

-- 
Daniel