I have been running our fax through a Cisco SPA122 since we switched to Vonage Business. Everything was working fine before the Balance 20 was installed. I am able to receive at least some faxes, but I am unable to send successfully. I can hear the handshake, but get a “fax failure” message about 30-40 seconds afterward.
The SPA122 has two phone lines, the other of which is used for voice and is still working.
What config changes does anyone think I need to make to get my faxes working again?