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2. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   Alcatel-Lucent 5060 IP Call server; Aricent SIP UA stack, B2BUA, proxy, VoLTE/RCS Client; AskoziaPBX; Avaya Application Server 5300 (AS5300), JITC certified ASSIP VoIP; Bicom Systems IP PBX for telecoms; Brekeke PBX, SIP PBX for service providers and enterprises; Cisco SIP Proxy Server, Cisco unified border element (CUBE), Cisco Unified ...

3. SipXecs - Wikipedia

   en.wikipedia.org/wiki/SipXecs

   SipXecs is designed as a software-only, distributed cloud application.It runs on the Linux operating system CentOS or RHEL on either virtualized or physical servers. A minimum configuration allows running all of the sipXecs components on a single server, including database, all available services, and the sipXecs management.

4. Session Initiation Protocol - Wikipedia

   en.wikipedia.org/wiki/Session_Initiation_Protocol

   The user agent client (UAC) sends SIP requests. The user agent server (UAS) receives requests and returns a SIP response. Unlike other network protocols that fix the roles of client and server, e.g., in HTTP, in which a web browser only acts as a client, and never as a server, SIP requires both peers to implement both roles.

5. SIP trunking - Wikipedia

   en.wikipedia.org/wiki/SIP_trunking

   SIP trunking is a voice over Internet Protocol (VoIP) technology and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based private branch exchange (IP-PBX) and unified communications facilities. [1]

6. SIMPLE (instant messaging protocol) - Wikipedia

   en.wikipedia.org/wiki/SIMPLE_(instant_messaging...

   RFC 4745 and RFC 5025 define a framework for authorization policies controlling access to application-specific data. The XCAP (RFC 4825), carried by HTTP, allows User Agents to communicate their presence rules to a XCAP server, which rules the information exposed by the presence server. RFC 3857 and RFC 3858 define a subscription event "watcher ...

7. Elastix - Wikipedia

   en.wikipedia.org/wiki/Elastix

   Elastix is a unified communications server software that brings together IP PBX, email, IM, faxing and collaboration functionality. It has a Web interface and includes capabilities such as a call center software with predictive dialing. The Elastix 2.5 functionality is based on open source projects including Asterisk, FreePBX, HylaFAX, Openfire ...

8. Asterisk (PBX) - Wikipedia

   en.wikipedia.org/wiki/Asterisk_(PBX)

   Asterisk is a software implementation of a private branch exchange (PBX). In conjunction with suitable telephony hardware interfaces and network applications, Asterisk is used to establish and control telephone calls between telecommunication endpoints such as customary telephone sets, destinations on the public switched telephone network (PSTN) and devices or services on voice over Internet ...

9. HERO Hosted PBX - Wikipedia

   en.wikipedia.org/wiki/HERO_Hosted_PBX

   HERO Hosted PBX is a SIP-based hosted IP-PBX business phone system, [1] first released in 2008 by Canadian telecommunications software provider Dialexia.The HERO (Hosted Enterprise Remote Office) software allows users to connect multiple phones (e.g., extensions, ring groups, etc.), share lines among several phones and implement business PBX telephone phone features such as voicemail, caller ...