[Serusers] Is SER for me ?

[Charalampos Alexopoulos]

Hi
Sorry if this is a stupid question, but before i dive to SIP protocol
and SER configuration i would like to know if SER doing what i need.
What i want to do is to make voip phone calls with my friends without to
use some voip provider like skype.
Is the SIP the correct think for this ?
Is the SER implementation suitable ?

Thank you in advance
Charalampos Alexopoulos