If you connect the FAX to FXS port of UCM, you hope to send and receive the FAX through the PSTN line of UCM, you can refer to the file:
1. let us create one IP extension, and do the below setting:
If you connect the FAX to FXS 1, here you need to choose FXS 1.
2. let us set the analog trunk, and set the option—FAX detection as no.
3. let us set the incoming fax of FXO 2 to the extension 5000 directly.
at the same time, the FAX can send the fax through the dilaing rule of UCM.