SIP Phone Alternatives

[Leonardo Meira <serra.meira@gmail.com>]

Hi Everyone, 

In Lenny I use Twinkle to use my SIP phone account. 
But in Squeeze I'd like to use another application in the place of Twinkle. Preferentially a software better integrated to the KDE 4.x/Qt 4.x desktop which is what I use. 

Any alternative? Please give me suggestions.

Thank you

serraemeira