Cisco ATA Fax Settings
The settings below are to be made on a Cisco analog adapter such as the SPA112.
On the SIP server side, you do not want to allow direct media.
NAT Keep Alive Enable: Yes Network Jitter Level: very high Jitter Buffer Adjustment: No Restrict Source IP: Yes
Call Waiting Serv: No Three Way Call Serv: No
FAX Passthru Method: ReINVITE FAX T38 ECM Enable: Yes Echo Canc Enable: No FAX Enable T38: Yes FAX T38 Redundancy: 3 Fax Tone Detect Mode: Callee Only