Question

VoIP technology enables to connect (i) Only PSTN telephones (ii) Only Mobile telephones (iii) Only VoIP telephone (iv) All IP enabled telephone systems connected to the Internet.

Answer 1

VoIP technology enables to connect all IP enabled telephone systems connected to the Internet.

Explanation:

An IP phone, more like a VoIP network, is connected to the internet via WiFi or ethernet. Preferably than accessing data and making a call through a hardwired telephone line, IP phones inquire and send information via the connected IP network. IP networks (and IP addresses) are administered by VoIP or PBX service providers. It employs voice over IP technologies for setting and communicating telephone calls over an IP network, like the Internet, rather than the traditional "Public Switched Telephone Network" (PSTN)

Answer 2

Explanation:

You can now use any phone to make Voice over Internet (VoIP) calls. Simply wait for the dial tone, and you're ready to make and receive calls...

Hope its help...