HP 5610xi All-in-one used to send faxes just fine until we switched from Vonage VOIP to Comcast. Connecting line to back of unit doesn't work. Slowing fax speed from fast to medium doesn't work. Dialing *99 first doesn't work. I can hear a brief dial tone then the line goes dead and eventually makes that loud alarm sound like the phone is off the hook.
The 5610 will send & recive with comcast try to do the test from the unit itself. Try to send a test fax to HP 1-888-473-2963 it will send you a return fax
Vonage does not support the faxes. sorry :-(
Have you checked with your service provider about sending fax from VOIP lines.
Because iam affraid HP does not support VOIP Services.
Even if you call HP Tech Support they will ask you to call your VOIP Service provider they should have a answer for that.
Because the HP Fax machine only supports Analog signals and the VOIP Services have Digital Siganls which the machine cannot recognise, So please contact your VOIP Services for the same to send send faxes because it is not the fax machine which cannot send fax it is your VOIP Service provider which has a problem.
Good Luck
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Thank you for the info and suggestion. I will call Comcast!
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