This is one disadvantage of using fax machine, you cannot receive a fax when your phone is off hook. Unless you have a dedicated phone line for the fax machine alone. internet fax on the other hand does not require a dedicated phone line and a fax machine. All fax documents are sent over the internet connection, which means you can send and receive faxes anytime and anywhere.
With most popular cable companies you can add a phone line for fax services. There are certain fax machines and devices that you can even share a fax line with a phone line.
Your question is unclear. If you have a single phone line, it can only be used for one thing at a time... you can talk on the phone, or send/receive fax data, not both (if you have "call waiting", switching from the fax to a call will disrupt the fax). If you have multiple lines, it depends on your fax machine, but in most cases you still wouldn't be able to send or receive a fax and talk on the phone at the same time. However, if you have a combination fax machine/phone, usually you CAN pick up the handset if a voice call comes in, even if the machine is set to default to fax mode.
Not in the normal way you'd send a fax. The fax machine needs to be connected to a phone line, not a cable line. Even if using a phone that is attached to a cable line, often the fax will not work because the phone is digital and fax machines have trouble with those types of phones.
Make sure that you have separate phone line for you fax machine and separate for your telephone. If not, even normal calls will make your fax machine rings.
To print to a fax machine wirelessly from a mobile phone: you would need a fax machine (or multifunction) with wifi capability. The drivers (or app) would be on the phone, and you could fax from the phone that way. This depends on the technology that both your phone and fax machine have. To fax from a mobile phone: there are services called "online fax" services that will let you send or receive faxes from a phone or computer. To fax wirlessly from a fax machine through a cell phone: this technology isn't on the market, however there are "GSM faxes" that can operate off of a cell phone signal.
As a fax machine is connected to the phone line, provided the fax machine has the option (not all fax machine have a phone/numeric keypad) one can simply lift the phone and press the keypad just as a normal phone.
use a cover sheet with "sensitive" or "confidential" marked on the cover sheet, as well phone the person to let them know the fax is coming and phone them after to make sure it's received.
If the fax was received and not printed: the fax number of the sending party would likely be in the fax log. If the fax was sent when the line was busy or wasn't received by the fax machine - there's no way of telling.
Each model is different. Usually "answer mode" will be that the fax will pick up the phone line after a certain number of rings. If this feature is not enabled, it will not pick up the phone (a fax would need to be received manually by pressing the "receive" button when the phone is ringing). If the feature is enabled, it will pick up the phone line after a designated number of rings (be sure to be aware of any conflicting systems like voicemail that either will pick up before the fax or won't answer if the fax picks up before it).
Through faxing machine or through special software (sometimes even without it). Generally you need to have a fax number and a PC. You can even send a fax from youl email client (like Thunderbird or The Bat)
In the far past, the fax machine was a service operated like a telegram service - fax services had dedicated stations to send and receive images. In the 1960s, the first "commercial" fax machines emerged. These went from big bulky units that needed to be hardwired in (most people installing or even demonstrating a fax had to physically wire in a phone line - phone jacks weren't common even then). Through the 80s and 90s the fax was the cornerstone of business, the email of the day.
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