Is there any way in which we can call computer to computer like using Gtalk in Linux. I found Gtalk and Yahoo messenger are still not available despite Linux popularity. Pidgin is available but without voice call support!
I’m not sure mate. I use voip myself, but in much more true to the meaning of voip. I have a account with voipcheap.com and use a SIP gateway. My standard telephone plugs in to the gateway and you just dial the number as normal just adding 00 then the country code. That can be calling a PC or landline/cell anywhere.
Skype uses a proprietary protocol. Nobody but Skype can use it.
The standard way (supported by a lot of hardware and software VoIP phones) to use VoIP is H323 or SIP, being SIP the most used nowadays. Ekiga (former Gnomemeeting) is the most known free software for VoIp (and video…), and supports both H323 and SIP… so from Ekiga you can talk to any H323/SIP capable software or phone.
In the network:telephony OBS repo you have others. See also List of SIP software - Wikipedia, the free encyclopedia
but that is not the issue, right? if an application is supposed to have a feature, then the feature should work. especially if it works on another linux distro (for example it worked flawlessly for me on ubuntu).