[Asterisk-video] Re to H324M video calls with chan_ss7 (it works)

[barbara_b02 at libero.it]

Hi Klaus!
I've read your instructions for H324M video calls with chan_ss7... 
Do I need it to make SIP-->3G videocalls?
If yes, in which directory must I apply it? I didn't understand it...
Now I have Asterisk-1.4.18 and fontventa files with rev>=209 and videocalls from 3G to X-Lite work, but not in the other direction.
I have this extensions.conf:

exten => _0X.,1,Set(GLOBAL(CELL)=${EXTEN})
exten => _0X.,n,h324m_call(dialcell at sip_to_cell)

[sip_to_cell]
exten => dialcell,1,Dial(mISDN/1/${CELL},40,tTkK)
exten => dialcell,n,Set(CHANNEL(transfercapability)=VIDEO)
exten => dialcell,n,NoOp(transfer=${CHANNEL(transfercapability)})
exten => dialcell,n,Set(CHANNEL(userinformationlayer1)=38)
exten => dialcell,n,NoOp(ul1=${CHANNEL(userinformationlayer1)})
exten => dialcell,n,Hangup()

What I'm doing wrong?

Thanks!
Best Regards
   Barbara