[Asterisk-video] XLite -> 3G handset = slow motion video

[IvánF G]

Hi all,

I'm testing video calls between XLite and 3g handsets using Asterisk
1.4.21.1 as PBX. I've got almost everything working except for an stranger
behavior with the video.

The escenary is the asterisk installed with an public IP adress and the
XLite softphone running on a PC behind a router (private IP). Well; I
register the XLite client in Asterisk and originate a call between the two
endpoints. The result is that:

- audio works fine in both directions
- 3G -> XLite video works perfectly too
- XLite -> 3G video has very good image quality BUT in slow motion, what
makes the video more and more delayed

I haven't seen nothing special in both the SIP and PRI debug (except
the *rtp.c:1286
ast_rtp_read: Unknown RTP codec 126 received* that I think doesn't matter,
for what I've seen around). I have configured XLite with only the h263p
video codec, and my sip.conf is:


[general]
context=default            ; Default context for incoming calls
allowoverlap=no            ; Disable overlap dialing support. (Default is
yes)
bindport=5060            ; UDP Port to bind to (SIP standard port is 5060)
bindaddr=X.X.X.X        ; asterisk IP address )
srvlookup=yes            ; Enable DNS SRV lookups on outbound calls
disallow=all            ; First disallow all codecs
allow=sln
allow=h263p
allow=amr
allow=g711a
allow=alaw
allow=gsm
dtmfmode = rfc2833        ; Set default dtmfmode for sending DTMF. Default:
rfc2833
videosupport=yes        ; Turn on support for SIP video.
maxcallbitrate=64        ; Maximum bitrate for video calls (default 384
kb/s)

[img4]
type=friend
username=img4
secret=img4
host=dynamic
nat=yes
disallow=all
allow=h263p
allow=alaw
allow=amr
allow=gsm
allow=raw
maxcallbitrate=60

Does anybody know the reason of this inapropiate "slow motion"? Is there a
solutions or is some kind of problem/incompatibility between Asterisk and
XLite? Something that could be resolved with the non-free version of XLite?

Thank in advance,

Torino
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.digium.com/pipermail/asterisk-video/attachments/20081226/424a235d/attachment.htm