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2. Voice over IP - Wikipedia

   en.wikipedia.org/wiki/Voice_over_IP

   Phone calls between subscribers of the same provider are usually free when flat-fee service is not available. [12] A VoIP phone is necessary to connect to a VoIP service provider. This can be implemented in several ways: Dedicated VoIP phones connect directly to the IP network using technologies such as wired Ethernet or Wi-Fi. These are ...

3. 10 Phone Systems for Small Businesses - AOL

   www.aol.com/10-phone-systems-small-businesses...

   OpenPhone subscriptions include unlimited calling and messaging, an auto attendant, call recording, and one new local or toll-free phone number. It integrates with email, HubSpot, Salesforce, and ...

4. VoIP phone - Wikipedia

   en.wikipedia.org/wiki/VoIP_phone

   A VoIP phone or IP phone uses voice over IP technologies for placing and transmitting telephone calls over an IP network, such as the Internet. [1] This is in contrast to a standard phone which uses the traditional public switched telephone network (PSTN).

5. ISDN User Part - Wikipedia

   en.wikipedia.org/wiki/ISDN_User_Part

   Call progress (CPG) — Contains additional information about the progress of a call. Normally sent after the ACM when the status of the call changes from that reported in the ACM. Answer message (ANM) — Sent when the subscriber picks up the phone, a resource is connected or answer supervision is returned by an interworking point.

6. Federated VoIP - Wikipedia

   en.wikipedia.org/wiki/Federated_VoIP

   Although there is no formal specification for federated VoIP as a whole, the Session Initiation Protocol (SIP) and Extensible Messaging and Presence Protocol (XMPP/Jabber) both specify similar and compatible ways of implementing federated VoIP. In particular: the use of ENUM to identify the SIP or Jabber addresses associated with a phone number

7. List of SIP response codes - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_response_codes

   An intermediary machine or process rejected the call attempt. [25] This contrasts with the 607 (Unwanted) SIP response code in which a human, the called party, rejected the call. The intermediary rejecting the call should include a Call-Info header with "purpose" value "jwscard", with the jCard [26] with contact details. The calling party can ...