asterisk users - Feb 2006 - Asterisk + Avaya DTMF problem

Hello all,

    I've got Asterisk and a TE205P.  One port on the TE205P talks over 
E1 ISDN PRI to the outside world (thorugh BT).  The other port talks to 
an Avaya switch, also over E1 ISDN PRI.  All is working well, except 
that when people try to dial out from the switch through Asterisk (with 
a TE205P) there are no DTMF tones transmitted to Asterisk.  DTMF seems 
to be fine when the Avaya switch is connected directly to the PRI, however.

    Any ideas?  The lack of tones being passed to * means that people 
can't dial out at the moment...

    Many thanks,

       Matt.