How can I answer when I receive a call? - Google Nexus S (16 GB) Smartphone

yes they do but not all if none of the volunteers know the answer then it would not receive one and when answered you receive an email

You can receive faxes automatically or manually. If you turn off the Auto Answer option, you must receive faxes manually. If you turn on the Auto Answer option (the default setting), the device automatically answers incoming calls and receives faxes after the number of rings that are specified by the Rings to Answer setting. (The default Rings to Answer setting is five rings.)
If you receive a legal-size fax and the device is not currently set to use legal-size paper, the device reduces the fax so that it fits on the paper that is loaded. If you have disabled the Automatic Reduction feature, the device prints the fax on two pages.
NOTE: If you are copying a document when a fax arrives, the fax is stored in the
device memory until the copying finishes. This can reduce the number of fax pages stored in memory.
This section contains the following topics:
• Receive a fax manually
• Set up backup fax reception
• Reprint received faxes from memory
• Poll to receive a fax
• Forward faxes to another number
• Set the paper size for received faxes
• Set automatic reduction for incoming faxes
• Block junk fax numbers
• Receive faxes to your computer (Fax to PC and Fax to Mac)
Receive a fax manually
When you are on the phone, the person you are speaking with can send you a fax while you are still connected. This is referred to as manual faxing. Use the instructions in this section to receive a manual fax.
NOTE: You can pick up the handset to talk or listen for fax tones.
You can receive faxes manually from a phone that is:
• Directly connected to the device (on the 2-EXT port)
• On the same phone line, but not directly connected to the device
NOTE: The automatic document feeder must be empty to receive a fax. If there are documents in the ADF, then the device will not be able to receive incoming faxes.
To receive a fax manually
1. Make sure the device is turned on and you have paper loaded in the input tray.
2. Remove any originals from the document feeder tray.
NOTE: The automatic document feeder must be empty to receive a fax. If there
are documents in the document feeder, then receiving the fax will be
unsuccessful.
3. Do one of the following to answer a fax manually:
• Set the Rings to Answer setting to a high number to allow you to answer the
incoming call before the device answers.
• Turn off the Auto Answer setting so that the device does not automatically
answer incoming calls.
4. If you are currently on the phone with the sender, instruct the sender to press Start on their fax machine.
5. When you hear fax tones from a sending fax machine, do the following:
a. Press START FAX Black or START FAX Color on the device control panel.
b. When prompted, select Fax Receive.
NOTE: Depending on your country/region, the device might receive the fax
automatically when you hear fax tones from the sending fax machine.
6. After the device begins to receive the fax, you can hang up the phone or remain on the line. The phone line is silent during fax transmission.

Introduction The HP All-in-One can receive faxes automatically or manually depending on the Auto Answer setting. If the Auto Answer option is set to On (the default setting), the HP All-in-One will automatically answer incoming calls and receive faxes after the number of rings specified by the Rings to Answer setting. (The default Rings to Answer setting is five rings). Refer to the given instructions to receive faxes automatically or manually. Receiving faxes The HP All-in-One can receive faxes automatically or manually. Receiving a fax automatically To receive faxes automatically, set the Auto Answer option to On (the default setting). The HP All-in-One will automatically answer incoming calls and receive faxes after the number of rings specified by the Rings to Answer setting. (The default Rings to Answer setting is five rings). Receiving a fax manually If the HP All-in-One has been set up to receive faxes manually (the Auto Answer option is set to Off ), or you answer the phone and hear fax tones, use these instructions to receive faxes.

1. Make sure the HP All-in-One is turned on and you have paper loaded in the input tray.
2. Remove any originals from the document feeder tray.
3. Set the Rings to Answer setting to a high number to allow you to answer the incoming call before the HP All-in-One answers. Or, turn off the Auto Answer setting so that the HP All-in-One does not automatically answer incoming calls.
4. If you are currently on the phone with the sender, instruct the sender to press Start on their fax machine.
5. When you hear fax tones from a sending fax machine, do the following:
   1. Press Start Fax Black or Start Fax Color on the control panel of the HP All-in- One.
   2. When prompted, press the down arrow to highlight Receive Fax Manually , and then press OK .
6. Press Start Fax Black again.
7. After the HP All-in-One begins to receive the fax, you can hang up the phone or remain on the line. The phone line is silent during fax transmission.
   
   
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Receiving a fax
Receiving a fax automatically
1 Make sure the printer is on and is connected to a working phone line.
2 Make sure that Auto Answer is on.
To check if Auto Answer is on:
a From the printer control panel, press (tool icon).
b Press the arrow buttons until Fax Setup appears, and then press ok.
c Press the arrow buttons until Ringing and Answering appears, and then press ok.
d Press again.
Check to see if Auto Answer is set to On.
e If Auto Answer is not set to on, press the arrow buttons until On appears, and then press to save the setting.
3 Set the number of times the telephone rings before the printer automatically receives faxes:
a Press the arrow buttons until Pick-up On appears, and then press ok.
b Press the arrow buttons until the setting that you want appears, and then press to save the setting.
When the number of rings you set is detected, the printer automatically receives the incoming fax.
Receiving a fax manually
1 Make sure the printer is on and is connected to a working telephone line.
2 Make sure that Auto Answer is off.
3 To receive the fax, press (green botton) or press * 9 * on the telephone after you answer it and hear fax tones.
4 Hang up the telephone.
The printer receives the fax.
Receiving a fax with an answering machine
1 Make sure that Auto Answer is on.
2 Make sure you have set the number of times the telephone rings before receiving a fax automatically.
When a telephone ring is detected, the answering machine picks up the call.
• If the printer detects a fax, it receives the fax and disconnects the answering machine.
• If the printer does not detect a fax, the answering machine receives the call.

3 Set the answering machine to answer incoming calls before the printer does.
For example, if you set the answering machine to answer calls after three rings, set the printer to answer calls
after five rings.
Forwarding faxes
Use the fax-forwarding feature if you are going to be away, but still want to receive your faxes. There are three
fax-forwarding values or settings:
• Off—(Default)
• Forward—The printer sends the fax to the designated fax number.
• Print & Forward—The printer prints the fax and then sends it to the designated fax number.
1 Make sure the printer is on and is connected to a working telephone line.
2 Press the arrow buttons until Fax Setup appears, and then press ok.
3 Press the arrow buttons until Ringing and Answering appears, and then press ok.
4 Press the arrow buttons until Fax Forward appears, and then press ok.
5 Press the arrow buttons until Forward or Print & Forward appears, and then press ok.
6 Enter the number to which you want to forward the fax, and then press ok.

Quoted from the manual: The HP all-in-one will not automatically answer calls. You must receive all faxes manually by pressing Start Fax Black or Start Fax Color. For information on receiving faxes manually, see Receive a fax manually. You might use this setting if the majority of calls on this phone line are voice calls and you rarely receive faxes.
This page has more information: http://www.fixya.com/support/p378554-hp_officejet_6210_all_in_one_inkjet/manual-3600/page-86

Receive a fax
Depending on the Auto Answer setting, your HP All-in-One can receive faxes
automatically or manually. If you have set the Auto Answer option to Off, you will
need to receive faxes manually. If the Auto Answer option is set to On (the default
setting), your HP All-in-One will automatically answer incoming calls and receive faxes
after the number of rings specified by the Rings to Answer setting. (The default
Rings to Answer setting is five rings.)
Receive a fax manually
If you set up your HP All-in-One to receive faxes manually (the Auto Answer option is
set to Off) or you answer the phone and hear fax tones,
1. Make sure the HP All-in-One is turned on and you have paper loaded in the input
tray.
2. Remove any originals from the document feeder tray.
3. If you are currently on the phone with the sender, instruct the sender to press
Start on their fax machine.
4. When you hear fax tones from a sending fax machine, do the following:
a. Press Fax on the control panel of your HP All-in-One.
b. When prompted, press 2 to select Receive fax.
c. After the HP All-in-One begins to receive the fax, you can hang up the phone.

Note: check your equipment for:
Fax machine must be connected to an answer machine

Receiving a fax automatically:
1 Make sure the Fax Auto Answer light is on.
2 To set the number of telephone rings before the printer automatically receives faxes,
Receiving a fax with an answering machine
When a telephone ring is detected, the answering machine picks up the call.
• If the printer detects a fax, it receives the fax and disconnects the answering machine.
• If the printer does not detect a fax, the answering machine receives the call.
2 Set the answering machine to answer incoming calls before the printer does.
For example, if you set the answering machine to answer calls after three rings, set the printer to answer calls
after five rings.
3 To set the number of telephone rings before the printer automatically receives faxes.

Link
Receiving a fax You can choose to receive a fax automatically, manually, or through an answering machine.
Note: For your All-In-One to receive a color fax, the machine from which you are receiving must also support color faxes.
Automatically Recommended for a dedicated fax line
Your All-In-One automatically accepts incoming faxes using the automatic answering mode. When the Auto Answer light is on, the All-In-One receives a fax after the specified number of rings set in the Options menu.
To set a number of rings for the automatic answering mode:

1. On the control panel, press Mode repeatedly until Fax is selected.
2. Press Options until ANSWER FAX WHEN appears.
3. Press + to choose After 1 ring, After 2 rings, After 3 rings (default), or After 5 rings.
4. Press Select.
5. Make sure the Auto Answer light on the All-In-One is on.

When the number of rings that you set is detected, the All-In-One automatically receives your fax.
Manually Recommended for a shared fax and telephone line
You can choose which incoming faxes to accept by setting your All-In-One to manual answering mode.

1. Make sure the All-In-One Auto Answer light is off.
2. Press *9* on the telephone after you answer the telephone and hear fax tones.
3. Hang up the telephone.

The All-In-One receives your fax.
Answering machine Recommended for a shared fax and telephone line
To receive a fax with an answering machine connected to your All-In-One, set the answering machine to answer incoming calls before the All-In-One does. For example, if you set the answering machine to answer calls after 3 rings, set the All-In-One to answer calls after 5 rings.

1. On the control panel, press Mode repeatedly until Fax is selected.
2. Press Options until ANSWER FAX WHEN appears.
3. Press + until After 5 rings appears.
4. Press Select.
5. Make sure the Auto Answer light on the All-In-One is on.

When a ring is detected, the answering machine picks up the call.

• If a fax is detected, the All-In-One receives the fax and disconnects the answering machine.
• If not, the answering machine completes the call.

Note: You must set up the equipment as shown in connecting to an answering machine.

The answer mode determines whether your HP All-in-One answers incoming calls or not.
• If you set the HP All-in-One to answer faxes automatically, the HP All-in-One will answer all incoming calls and receive faxes. Set the Auto Answer setting to On. • If you set the HP All-in-One to answer faxes manually, you must be available to respond in person to the incoming fax call or your HP All-in-One will not receive faxes. Set the Auto Answer setting to Off. For more information on receiving faxes manually, see Receive a fax manually. If you do not know which answer mode to use, see Choose the recommended answer mode for your setup.
To set the answer mode 1 Press Setup. 2 Press 4, and then press 2. This selects Basic Fax Setup and then selects Auto Answer.
3 Press right arrow to select On or Off. 4 Press OK to accept the setting.

yeppers...same thing happens to mine. So, I simply set it to receive faxes manually now.