Sorry, here it the dial peers i'm using :
-------Dial-peer for incoming PSTN Call---------
dial-peer voice 100 pots
incoming called-number ..
direct-inward-dial
-------Dial-Peer voip pointing to the fax server------
dial-peer voice 10 voip
description -- To FAX Server
destination-pattern 6.
session target ipv4:172.16.110.110
dtmf-relay h245-alphanumeric
codec g711ulaw
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i used also these command ::
voice service voip
fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco
Thx again