hello a problem with my CANCEL frames!

user-------openser------asterisk

invite>>>>>>>|>>>>>>invite
ringing<<<<<<|<<<<<<ringing
cancel>>>>>>>|

in fact, I don't know where forward the cancel in stateless!
I have no information in the frame to forward it to the right asterisk (one for g711, one for g729...)

have you an idea? thank you all

Cordialement

BERGANZ François

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