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2. Analog telephone adapter - Wikipedia

   en.wikipedia.org/wiki/Analog_telephone_adapter

   A typical analog telephone adapter for connecting an analog phone to a VoIP provider Wikimedia Commons has media related to Analog telephony adapter . An analog telephone adapter ( ATA ) or FXS gateway is a device for connecting traditional analog telephones, fax machines, and similar customer-premises devices to a digital telephone system or a ...

3. Telephone VoIP adapter - Wikipedia

   en.wikipedia.org/wiki/Telephone_VoIP_Adapter

   A telephone VoIP adapter (TVA), also called digital telephone adapter, is a device that interfaces digital private branch exchange (PBX) telephone sets to a Voice over Internet Protocol (VoIP) network, using, for example, the Session Initiation Protocol.

4. FXO and FXS - Wikipedia

   en.wikipedia.org/wiki/FXO_and_FXS

   Local number portability allows an existing number to be moved to VoIP (or, in some countries, a mobile telephone) which can then be freely moved out of the original geographic location while keeping the directory listing and service area unchanged. A foreign exchange office (FXO) device plays the role of an analog phone.

5. VoIP phone - Wikipedia

   en.wikipedia.org/wiki/VoIP_phone

   Analog telephone adapters provide an interface for traditional analog telephones to a voice-over-IP network. They connect to the Internet or local area network using an Ethernet port and have jacks that provide a standard RJ11 interface that can accommodate a standard analog telephone.

6. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."

7. H.323 - Wikipedia

   en.wikipedia.org/wiki/H.323

   ITU-T Recommendation H.323 is one of the standards used in VoIP. VoIP requires a connection to the Internet or another packet switched network, a subscription to a VoIP service provider and a client (an analogue telephone adapter (ATA), VoIP Phone or "soft phone"). The service provider offers the connection to other VoIP services or to the PSTN.