If you experience problems when faxing over VoIP, try the following options:
- Change the fax speed to a lower speed.
- From the printer control panel, press Home.
- Select Fax Settings, then press OK.
- Select Fax Speed, then using the left and right arrow buttons to change the speed; for example, "Slow (9.6K)", then press OK.
- Select a standard resolution to reduce the amount of information that is transmitted.
- From the printer control panel, press Home.
- Select Send Fax, then press OK.
- Select Fax Options, then press OK.
- Select Resolution.
- Select Standard for the resolution, then press OK.
- Turn Error Correction Mode (ECM) off.
NOTE: ECM off may result in a lower quality document.
- From your printer control panel, press Home.
- Select Fax Settings, then press OK.
- Select Error Correction.
- Make sure ECM is set to Off, then select OK to save the settings.
- Contact your phone service provider to increase the allocated bandwidth and transmission block lengths to allow better data communication, if possible.
NOTE: Fax over VoIP can cause problems. We recommend that you keep a standard phone line (POTS) for reliable and consistent faxing, especially if you are in one of the following categories:
- You or your business depends heavily on faxing.
- You or your business needs to fax highly detailed documents, such as legal contracts or images.
- Your fax documents have many pages.