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15-Dec-2016 01:56

There are several Wi-Fi enabled mobile phones and PDAs that have pre-installed SIP client software, or are capable of running IP telephony clients, including most smartphones.

Analog telephone adapters provide an interface for traditional analog telephones to a voice-over-IP network.

In addition, a Vo IP signalling protocol stack, such as for the Session Initiation Protocol (SIP), H.323, Skinny Call Control Protocol (Cisco), and Skype, is needed.

For media streams, the Real-time Transport Protocol (RTP) is used in most Vo IP systems.

A Vo IP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet, instead of the traditional public switched telephone network (PSTN).

Digital IP-based telephone service uses control protocols such as the Session Initiation Protocol (SIP), Skinny Client Control Protocol (SCCP) or various other proprietary protocols.

While a license is required to run one of these in most countries these can be useful on ships or remote areas where a low-powered gateway transmitting on unused frequencies is likely to go unnoticed.

Some Vo IP phones also support PSTN phone lines directly.

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A Session Traversal Utilities for NAT (STUN) client is used on some SIP-based Vo IP phones as firewalls on network interface sometimes block SIP/RTP packets.They also typically support the USB but not Ethernet or Power over Ethernet interfaces, at least as of late 2011.