[Asterisk-video] Asterisk mp4play getting audio but no video

[Renju WM]

Hi finally i setup mp4play in my server but when i play a file using
softphones i am getting only audio...not getting any video..and asterisk
console not showing error...
please help...do i have to make any changes in the sip.conf ? the following
is my settings
;
; SIP Configuration
-------------------------------
;

[general]
context=default
allowoverlap=no
bindport=5060
bindaddr=0.0.0.0
srvlookup=yes
defaultexpiry=1800
disallow=all
allow=ulaw
allow=alaw
allow=gsm
allow=h263p
videosupport=yes

[999]
type = friend
context = default
host = dynamic
secret = 999
disallow = all
allow = ulaw

Extensions.conf
-----------------------

[default]
exten => 999,1,Answer
exten => 999,2,Wait(2)
exten => 999,3,mp4play(/root/tmp/welcome.3gp)
exten => 999,4,Hangup

-- 
Renju
Many of the great achievements of the world were accomplished by tired and
discouraged men who kept on working
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