T-Mobile Wing rings normally when calls are received and calls can be dialed OK. HOWEVER, when connected on an incoming or outgoing call, I cannot hear the other party and they cannot hear me. I tried the MUTE button but the problem persists whether it says "Mute" or "Unmute". Volume is up to max. Also, Camera works OK BUT the "click" sound is not heard when taking a photo anymore. I pushed RESET and when phone came on again I heard the "coming alive" sound but still no sound when making or receiving calls.

Question edited fir clarity

Ideas here. You can also Google
make model manual
See if it is a an outgoing call barring feature.

https://www.google.com/search?q=I-DECT+Phone.+It+receives+incoming+calls+but+won%27t+dial+outgoing

..

Did you try switching off and switching on your mobile or just try once with airplane mode and check once this should be issue with network

Make sure that you have got sufficient credit to enable you to make outgoing calls. You can still normally receive incoming calls with no credit but make any except to emergency numbers.

For this problem contact the mobile service provider.........

Hi,
To cancel bared incoming calls on your phone, enter one of the code given below.
##67#, ##21#,##62# or ##61# then okay/send/yes. the phone will be unbarred.
Regards

Check Windows Sound mixer for application volume. Down in system tray at right side of taskbar double click sound icon for XP or click sound icon once and click Mixer for Vista. Look through volume settings for your phone application. Make sure it is not muted and volume is up.

increase the volumes of ring tones ,unscrew the phone to check if the ringer is not faulty or damaged,repair or replace it ok

the internet connection's outgoing is too slow. ALl internet connections have an outgoing and an incoming speed. Make sure you are not uploading anything to the internet or get a faster internet service provider

Use the network services menu for this...

Use this menu to access network services. Please
contact your service provider to check their availability and subscribe to them, if you wish.

This network service allows you to restrict your calls.
1. Select a call barring option:
• All outgoing: prohibit outgoing calls.
• International: prohibit international calls.
• International except home: only allow calls
to numbers within the current country when
you are abroad, and to your home country.
• All incoming: prohibit incoming calls.
• Incoming while abroad: prohibit incoming
calls when you use your phone outside of your
home country.
• Cancel all: cancel all call barring settings,
allowing to be sent and received normally.
• Change barring password: change the call
barring password obtained from your service
provider.
2. Select the type of calls to be barred.
This network service allows you to restrict your calls.
1. Select a call barring option:
• All outgoing: prohibit outgoing calls.
• International: prohibit international calls.
• International except home: only allow calls
to numbers within the current country when
you are abroad, and to your home country.
• All incoming: prohibit incoming calls.
• Incoming while abroad: prohibit incoming
calls when you use your phone outside of your
home country.
• Cancel all: cancel all call barring settings,
allowing to be sent and received normally.
• Change barring password: change the call
barring password obtained from your service
provider.
2. Select the type of calls to be barred.

if you have any queries about your mobile..you can have a look at this user manual which can be downloaded from

http://safemanuals.com/user-guide-instructions-owner-manual/SAMSUNG/SGH-D600-_E

hope this helps :)