Faxing and Voip

[Stargean13]

Prior to obtaining a new modem I was able to fax and receive faxes. Currently the fax test indicates that there is no active phone line. The phone has a dial tone. I have the lines in the correct ports, to no avail. I have an HP Officejet pro all in one 6978. I have contacted xfinity but they couldn’t address this. I would appreciate any assistance. Thank you! 

[BeemerBiker]

There are problems faxing over a VOIP line.  Usually the problem is poor transmission rather than no signal.

ChatGPT gave detailed information but basically the summery is all that is needed

Summary (best settings for Xfinity + HP 6978)

Setting Value

Connection	LINE → Tel 1 port on Xfinity modem
Fax Speed	Slow (9600 bps)
ECM	Off
Call Waiting	Disabled (*70 prefix)
Cable	Short, direct, no splitters
Alternative	HP Smart App Internet Fax

If you want more info please get a free account and ask there. For example, the AI asked me the following

If you’d like, tell me which exact Xfinity modem/gateway model you have (e.g., Arris TG1682G, XB7, XB8, etc.) — I can give precise port and wiring guidance for that unit, since some have quirks with their telephone jacks. Would you like me to show that next?

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If the above does now work, consider getting an adapter

You could also scan to your PC and then use an email to fax service.  My son does this but he does not fax very much.