[Asterisk-video] video call work in one side

[gmail]

i have a problem in making video call from one X-lite softphone to another , after i dial from 3500 to 3501 extension , and i press start video on extension 3500 (the calling party) the video is recived by 3501, but in the same call when  i press start video on 3501 (the called party) no video is sent to 3500 , when i reverse the call - that is when i dial from 3501 to 3500 the matter is reversed and only 3500 (the called party) recive video , that's we can say that only the called part can recive the video,  here is my sip.conf file :



[general]
port = 5060
bindaddr = 0.0.0.0
pedantic=yes
videosupport=yes


[3500]
type=friend
secret=3500
host=dynamic
canreinvite=no
context=default
disallow=all
allow=ulaw
allow=alaw
allow=speex
allow=gsm
allow=h261
allow=h263
allow=h263p

[3501]
type=friend
secret=3501
canreinvite=no
host=dynamic
context=default
disallow=all
allow=ulaw
allow=alaw
allow=speex
allow=gsm
allow=h261
allow=h263
allow=h263p
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