Fax and Voip

Hi All
We have a national backbone with Cisco As5400, As5350 , 2600 etc and Alcatel 7515 Gws. But our softswitch does not support both (T.38 and passthrough)fax protocol at the same time. So we often have to change in all media gateways the IOS images, since we can not find a error free release. One supports T.38 but makes echo, one doesnot support G711alaw modem passthrough, one does not work with Alcatel 7515 etc...
So I just want to ask your experiences for the gateways that I stated above. What IOS releases are you using? Can anybody suggest a release for the above specifications?
Best Regards...
Deniz

VISM V3.1.2 supports Fax Passthrough

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