Kind of at my wits end on this one. We have recently moved some of our customers to SIP for IB and OB calling. Along with this we have fax machines connected to ATA's. I can get IB faxes to work by changing a few things on the CUBE;
voice service voip
allow-connections sip to sip
fax protocol none
modem passthrough nse codec g711ulaw
And creating a Dial-Peer for each fax machine;
dial-peer voice 920 voip
destination-pattern +15551234567
no modem passthrough
session protocol sipv2
session target ipv4:10.x.x.x
incoming called-number +15551234567
dtmf-relay rtp-nte
codec g711ulaw
fax-relay ecm disable
fax-relay sg3-to-g3
no vad
However I cannot get OB faxing to work. I have tried T.38/Fax-Passthrough, different speeds, and disabling ECM on the ATA's and the Fax machines themselves.
Any help would be appreciated.
Thanks.
