During voice chat internet connection(broadband) disconnects very often generally 3 -4 times in just

connection: bsnl -ADSL-256kbps

voip tool: skype,yahoo messenger

win-xp ,2.4ghz,256 MB ram

antivirus -avg and avast

win xp -firewall

During voice chat internet connection(broadband) disconnects very often generally 3 -4 times in just 5 min?anti virus protection

Check whether they are really providing 256kbps ?

BSNL service is the worst service I have ever seen in my life. Here is the link which you can use to check the bandwidth of your connection:

http://promos.mcafee.com/speedometer/tes...

If you have any other computer try checking with that computer using the same line. It will help you in isolating the issue.

During voice chat internet connection(broadband) disconnects very often generally 3 -4 times in just 5 min?antivirus

her you can test your concection

http://myvoipspeed.visualware.com/

could be your antivrus and firewall