I have few questions in my mind these are always making me confuse if any body have knowledge about these so please share your knowledge:
1-How different telecom service providers are connecting to each other?
2-How International call is being process between different telecom service providers or in other words how diffrent countries are communicating to each other for voice or data?
3-How multiple internet service providers are communicating?
4-If I have one branch with MPLS VPN CONNECTIVITY OF A service provider in India and another branch is located in UK there is no A service provider’s network available so how both branch will connect ?