We all know that, only yahoo messenger and msn messenger both user can chat each other without using different clients. Now, Google has made VOIP between Gtalk, Yahoo! Messenger and MSN Messenger for free.
Just login your GTalk Messenger and add firstname.lastname@example.org as your Gtalk friend and then send the following message to your friend who is on MSN or Yahoo!.
For Voice chat, follow the same by sending the following message…
I have added service@gtalk2voip on my GTalk. It’s working nicely and you should checkout ..
Read more about it here GoogleTalk to VoIP Service