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Problem with ATA 187

I use  ATA 187 (firmware ATA187.9-03-0) with cucm for fax. the topo below

PSTN---- T1---- GW ---H323(g711 u-law) T38 -----CUCM ----SIP-t38----ATA 187 ------FAXServer ( Brother 2920).

I used fax relay with T38 protocol  and fax rate set to 9600 bps.Fax sending is ok. But having trouble with receiving, sometime success some time failed. Letters show a lack , not clearly.

I tried fax pass-through but i hear a busy tone when i called to fax number.

I saw in the forum have alot of issed with ATA187.

This is GW configure:

dial-peer voice 4001 voip

description To Oslo Pub FAX

destination-pattern XXXXXXX

session target ipv4:XXXXXXX

voice-class h323 1

dtmf-relay h245-alphanumeric

codec g711ulaw

fax-relay ecm disable

fax rate 9600

fax protocol t38 ls-redundancy 2 hs-redundancy 2 fallback pass-through g711ulaw

ip qos dscp cs3 signaling

no vad

Please help me

Thanks alot

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