[Asterisk-Users] Best codec for faxes?

[Matthew Boehm]

I'm not using asterisk as the "fax machine" a la rxfax and the like. I'm
using an ATA (linksys, grandstream, etc) plugged into a fax machine. I know
not to use 729 for faxing. Which 'should' I use?

I get lots of these:

    Unknown RTP codec 96 received

When I send a fax to the ATA from PSTN. Faxes from ATA to PSTN work fine.
Any ideas on that one?

Thanks,
Matthew