So, to document this, the likelihood of a fax working goes in this order best to worse:1. POTS -> fax 2. POTS -> FXO-TDM400P-FXS -> fax 3. T1 -> TE410P -> channel bank -> fax 4. T1 -> TE110P -> PCI -> TE110P -> channel bank -> fax 5. T1 -> TE110P -> PCI -> TDM400P-FXS -> fax 6. T1 -> TE110P -> PCI -> Ethernet/IP -> IAXy -> fax 7. FXO-TDM400P -> PCI -> Ethernet/IP -> IAXy -> fax Is this a correct? If it's not a PCI problem then there shouldn't be much of a difference between options 3 and 4. If it's a card issue then it would be nice to know which T1 cards handle fax better than others.
Yes, BUT!!! be aware that if you have an E1 pri from your telco a T1 channel bank will not help anything. In this case (your option 3) native bridging will be possible and asterisk will have to transcode giving you the some problems again.....
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