No Audio after 3cx windows client update

[sanketgroup]

hi
i just downloaded new version of Windows client.
Server has also been upgraded to SP1.

After client upgrade, many windows system client are not able to hear or transmit the audio.
Even they are not able to dial out the number. Client shows successful registration (green light) but server say "Not registered".

This happened only after SP1 server and client upgrade.
Please help me as lot of clients are not able to use their extension.

Thanx