kya koi bata sakta ha k yeh jo google ka eik messenger ha google talk ya gtalk jis say kisi dosray gmail user say online chat ki ja sakti ha, balkay agar mic ore speaker ho to phir call b ki ja sakti ha

to yeh jo call kartay hain gtalk say dosray gtalk user ko woh kya bilkul free hoti ha ya koi charges b hotay hain is k ? yeh skype ki tarah free ha ya nahi ?

agar eik gmail user gtalk say dosray gmail user ko gtalk par call karay to free hogi ? kitni dair tak baat kar sakta ha maximum ?