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A Vo IP phone or application may have many features an analog phone doesn't support, such as e-mail-like IDs for contacts that may be easier to remember than names or phone numbers, or easy sharing of contact lists among multiple accounts.Generally the features of Vo IP phones follow those of Skype and other PC-based phone services, which have richer feature sets but (because they rely on mainstream operating systems' IP support) latency-related audio problems.Vo IP phones can be simple software-based softphones or purpose-built hardware devices that appear much like an ordinary telephone or a cordless phone.
The software automatically configures the network and Vo IP service parameters.
There are alternate mechanisms for traversal of NAT, STUN is just one of them.
STUN or any other NAT traversal mechanism is not required when the two SIP phones connecting are routable from each other and no firewall exists in between.
Skype is a Vo IP service, which uses the Internet to allow people to make and receive free voice and video calls online for free or for cheap.
Vo IP has during the past decade showed the way to communicators how to go around the expensive PSTN and cellular plans and make international calls for free or cheap.
A competing view is that as mainstream operating systems become better at voice applications with appropriate Quality of Service (Qo S) guarantees and 5G handoff (IEEE 802.21 etc.) becomes available from outdoor wireless carriers, netbooks and smartphones will simply become the dominant interfaces.