Fax between ATA on port 2 and Router with FXS (g729 codec)

Posted: May 25, 2006 by sankar in Analog, ATA186, Fax

Fax setup that works:

Fax on port 2 of ATA, LBRcodec = 3, Connect mode bit 21 = 1.

Router has dial-peer with g729r8 (br8) codec and fax machine on FXS port.

Commands in dial-peer:

dial-peer voice 10 voip

codec g729r8|br8

modem passthrough nse codec g711ulaw

fax rate disable

fax protocol pass-through g711ulaw

Fax setup that didnt work

Fax on port 2 of ATA, LBRcodec = 3, Connect mode bit 21 = 1.

Router has dial-peer with g729r8 (br8) codec and fax machine on FXS port.

Commands in dial-peer:

dial-peer voice 10 voip

codec g729r8|br8

fax rate disable

fax protocol pass-through g711ulaw

Conclusion : With out modem passthrough, Fax passthrough on routers are not working!

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