asterisk users - Jun 2006 - Sip re-invite

Hi all,
I'm testing the re-invite with an * box and two phones (ywh500 ewith
pa1688 chipset) but it doesn't wotk.
The phones support the re-invite, and i use this row to dial (without
Ttr)
 
exten => s,22,Dial(${tjext})
 
and put canreinvite = yes in my sip.conf.
 
Anyone can help me pls ?
 
Thanks
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