UUI under sip in 5400hpx

Hi all, hope someone can give an advice on this: I need to send the UUI (user-user info in q931) from 5400 to an ip-ip box (Sansay vsx). Tracing the Sansay; i see UUI when using H323 but not when I use sip. Does anyone know how can I enable UUI capability on a 5400 using sip? thank you.

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robert.schira
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