I am unable to receive and make the calls. However, the ringing tone rings but when i receive the calls, the reciepant's voice is not hearable. On the right top, a 'headset' device icon appears. Please help.

There is a problem with your headset base.(probably in the jack sensing area) pls use some solvent to clean the jack base. its better if consult a mobile phone technician.

Some how your phone was reset or had the tone turned off. Just follow the below guide and your audio should come back on. I would do a soft reset (turn off the handset, remove the battery then reinsert) before performing the instructions.

Tone settings
To select a ringing tone for voice calls, select Tones >
Ringing tone.
To select a ringing tone for video calls, select Tones > Video
call tone.
To set the ringing type, select Tones > Ringing type. You
can also set the device to sound a ringing tone that is a
combination of the spoken name of the caller and the
selected ringing tone, when someone from your contacts list
calls you. Select Tones > Say caller's name.
To set the volume level of the ringing tone, select Tones >
Ringing volume.
To set the various alert tones, select Tones > Message alert
tone, E-mail alert tone, Calendar alarm tone, or Clock
alarm tone.
To set the device to vibrate when you receive a call, select
Tones > Vibrating alert.
To set the volume level of the device keypad tones, select
Tones > Keypad tones.

I have included a link to download your user manual if needed, it comes as a PDF file so you need to have adobe PDF down loader

http://nds1.nokia.com/phones/files/guides/Nokia_E63-1_UG_en.pdf

Step by step information at the link below.
Brother Fax T96
The F/T Mode is used to allow the fax machine and the telephones to share the same telephone line. When a call comes in, the fax machine and all extension telephones on that line will ring according to the number of rings you have set for the Ring Delay.
When the Ring Delay is completed, the fax machine will answer the call and determine if it is a fax call or a telephone (voice) call.
The fax machine can determine this by the signal it is receiving on the telephone line. If someone is sending a fax automatically , the sending fax machine will transmit a fax tone (a series of beeps every 3 seconds).
If your fax machine hears these tones, it will receive the fax.

If the fax machine does not hear any fax tones, it assumes it is a telephone (voice) call and will begin ringing the F/T ring tones (double ring) for the length of time you selected for the F/T Ring Time. These tones will only ring on the fax machine's handset (extension or external phones will not ring). At the end of the F/T ring time the fax machine will go into the receive mode in order to receive a manual fax.
(If the call was a voice call and was not answered, the caller will hear the fax receive tones also).

• If you answer the call before the fax machine(during the ring delay period) and determine it is a fax, you can transfer the fax to the fax machine for receiving.
  
  
• If you answer the call on an "extension" phone and hear a beep every 3 seconds (automatic fax) or silence (manual fax), press *51 or *91 for New Zealand (remote activation code) on the telephone keypad, wait to hear the fax machine turn on (chirping sounds) and then hang up.
  
  
• If you answer on the handset of the fax machine and hear a beep every 3 seconds or silence, press the Fax Start or Start/Copy key on the control panel of the fax machine and then hang up the handset.
  
  
• If you answer a call on an "extension" phone during the F/T Ring Time, you will hear the F/T ring tones.
  To release the call from the fax machine, press #51 or #91 for New Zealand (remote deactivation code) on the telephone keypad and you can speak to the calling party.
  
  
• If you pick up the handset of the fax machine during the F/T ring time, you may talk to the calling party immediately.

The answer mode determines whether the HP Fax answers incoming calls or not.

Different answer modes are :

* Fax

The HP Fax will automatically answer all incoming calls using the Rings to Answer setting. This is the default setting.

* FaxTel (unit with handset model only)

The HP Fax automatically answers all incoming calls using the Rings to Answer setting. If the call is a fax call, the HP Fax will receive the fax. If the call is a voice call, the HP Fax will create a special ring to indicate it is a voice call. The incoming voice call will need to be answered using the attached handset.

NOTE: If the HP Fax determines the call is a voice call, only the HP Fax will ring with the special ring tone. The other phones on the same phone line will not ring at all. You will not be able to pick up the voice call using the other phones.

* Tel

The HP Fax will not automatically answer calls. Faxes will need to be received manually.

* AnswerMachine

The HP Fax will monitor the line when an incoming call is answered by a person or by the answering machine. If the HP Fax detects fax tones on the line, it will receive the fax.

Depending on the model, you can set to fax only (which you have), fax/phone mode (starts up for a fax and re-rings for a voice call), or manual receive (YOU must press start to receive a fax. Some models have the options right on the front control panel. Some require programming to be accessed. Either way, an owners manual may be available online.

Please rate me if this helps.

Under settings menu touch, more, applications, voice command, call alert. Change to ring only. Hope this helps.

Receive Mode Settings Select from the following receive mode options to suit your needs. Once you've decided on which receive mode to use, follow the below instructions to set the receive mode using the operation panel. Receive Mode Setting

1. Press the <FAX> button to enter Fax mode.
   
2. Press <Menu>.
   
3. Press the right or left arrow button to select [Receive mode settings], then press the <OK> button.
   
4. Press the up or down arrow to select the receive mode that best suits your needs, then press <OK>.
   
   

Types of receive mode
Select the receive mode according to your needs.
Receive mode
Purpose
FAX/TEL AUTO SW When you want to receive faxes automatically as well as voice calls. FAX ONLY MODE When you want to receive only faxes automatically with your machine, or have a dedicated telephone line for FAX use only. DRPD When you have subscribed to a DRPD service with your telephone company. MANUAL MODE When you receive mainly voice calls and sometimes faxes, or want to receive faxes manually. ANS.MACHINE MODE When you want to receive voice messages on your answering machine and receive faxes automatically. FAX/TEL auto switch
FAX :
The machine does not ring but will receive the fax automatically. Voice call :
The phone attached to the machine will ring. Pick up the handset to answer the call. Note:

• Ring start timing and Telephone ring length can be specified in FAX/TEL auto switch in the Receive mode settings.
  
• If you want the telephone to ring when it receives a fax, connect a telephone to your machine and enable the Incoming ring settings in RX settings.
  
• The phone attached to the machine may not ring depending on the telephone type you are using.

FAX only
FAX * :
The telephone does not ring. The machine will receive the fax automatically. Voice call :
You will not be able to answer the call. * If you want the telephone to ring, connect the telephone to your machine and enable the Incoming ring settings in RX settings menu.


DRPD
FAX :
Your telephone line will ring according to the ring pattern you have chosen and receive the fax automatically. Voice call :
Your telephone line will ring according to the ring pattern you have chosen. Pick up the handset to answer the call. Note: Specify the FAX pattern in the DRPD: Set FAX ring pat. in RX settings menu.

Manual RX
FAX :
The telephone attached to the machine will ring. Pick up the handset and if you hear a beep tone, press the <Color> or <Black> button on the machine to receive the fax. Voice call :
The telephone attached to the machine will ring. Pick up the handset to answer the call. Note: If you are far from your machine, you can use the remote receiving function to receive faxes. Pick up the handset of the telephone connected to the machine and press 25 (the remote receiving ID).

Ans. machine connect
FAX :
First the answering machine connected to your machine will respond to an incoming call, and then the machine will receive faxes automatically. Voice call :
The answering machine connected to your machine will respond to an incoming call. Note:

• Set the answering machine to answer on the first or second ring.
  
• The entire message should be no longer than 15
  

i have no ringtone after calling

Your phone can have 3 options, Ring all the time, Switch between Voice and Ring, or Voice all the time.

From your phone(s) press PROG 21 and press the ENTER soft key (3rd key). Now press the SEL (3rd key) until it says VOICE CALL then press ENTER and EXIT. If you set it to this mode, the AUTO ANS button won't work.

If you select TONE, the Auto Answe button will work, making the phone VOICE CALL when lit and ring when not.

If you select VOICE CALL DENY, the AUTO ANS button still won't work and ...you get the pattern.

Carl

Press the 'RECEIVE MODE' button on the right side of the control panel, its next to the large 'FAX START' button. Here are your options :

Select Receive Mode
MANUAL
—You must answer all calls yourself. If you hear fax tones, press
Fax Start
to begin receiving the fax, then hang up. You can use this mode with
Distinctive Ringing. (See
Distinctive Ring
, page 8-1.)
FAX ONLY
—The fax machine automatically answers every call as a fax call. You
cannot receive a voice call, but you can dial out and make a voice call.
FAX/TEL
—The fax machine automatically answers every call. If the call is a fax, it
prints the fax. If the call is not a fax, it signals you with a double-ring (ring-ring),
different from the phone company ringing, to alert you to pick up the call. If you select
this setting, you’ll need to set the Ring Delay and F/T Ring Time features (on the
following pages). If you have extension phones on the same line as the fax machine,
set Ring Delay to 4. (See
For FAX/TEL Mode Only
, page 5-5.)
TAD:ANSWER MACH.
—This is the only setting in which you can use an external
answering machine. Your telephone answering device is connected to your fax
machine, and answers every call. Once the TAD answers, the fax machine listens for
fax tones. If it detects fax tones, it prints the fax.
The TAD setting works
only
with an external telephone answering device (TAD); it
does not work with telephone company Voice Mail. Ring Delay and F/T Ring Time
do
not
work in this setting.