asterisk users - Nov 2013 - overlapdialing and no digits in setup problem

Hello!

I have asterisk which is connected to avaya definity.
I set trunk to overlap.
When I call to this trunk (so called tac in avaya) without any number
I hear dial tone for some time, any digit I try to dial are ignored by 
asterisk- still tone, then call is rejected:


     -- Accepting overlap call from '6401' to
'<unspecified>' on channel
0/9, span 3
     -- Starting simple switch on 'DAHDI/i3/6401-f'
       -- Going to extension s|1 because of empty extension received on 
overlap call
     -- Hungup 'DAHDI/i3/6401-f'

on avaya side it looks like:

16:28:51     dial 802
16:28:51     term trunk-group 2    cid 0x66
16:28:51     dial 802
16:28:51     seize trunk-group 2 member 8  cid 0x66
16:28:51     Calling Number & Name 6401 D.Melekhov
16:28:51     dial 802
16:28:51     seize trunk-group 2 member 8  cid 0x66
16:28:59     denial event 1166: Unassigned number D1=0x6 D2=0x101
16:28:59     idle trunk-group 2 member 8  cid 0x66
16:29:01     idle station    6401 cid 0x66
16:29:01     tone-receiver     01AXX02 cid 0x6a
16:29:01     active station    6401 cid 0x6a
16:29:02     idle station    6401 cid 0x6a

but if I call on the same way panasonic, panasonic handles dgitis I dial:

16:31:25     hold station    6401 cid 0x52
16:31:25     active station    6401 cid 0x98
16:31:26     dial 803
16:31:26     term trunk-group 3    cid 0x98
16:31:26     dial 803
16:31:26     seize trunk-group 3 member 1  cid 0x98
16:31:26     Calling Number & Name 6401 D.Melekhov
16:31:26     dial 803
16:31:26     seize trunk-group 3 member 1  cid 0x98
16:31:29     Proceed trunk-group 3 member 1  cid 0x98
16:31:29     Alert trunk-group 3 member 1  cid 0x98
16:31:32     active trunk-group 3 member 1  cid 0x98
16:31:35     idle station    6401 cid 0x98
16:31:36     active station    6401 cid 0x9b
16:31:36     idle station    6401 cid 0x9b


Could you tell me how can I get the same behaviour from asterisk?
Looks like it just ignores dtmf...

Thank you!