call problems on thl w100
 

Hello,
I use the thl w100, and experiencing the following problem:
When anybody tries to call my w100 from another line, it does not respond at all for at least 5-6 rings the caller hears on his side. Alike – when I try to make a call from the w100, it takes plenty of time until the call us established.
I would be most grateful for any help.