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2. List of SIP software - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_software

   ShoreTel IP phone systems with unified communications and contact center built in Snom One free/blue/yellow (Snom acquired and renamed pbxnsip) (SIP) Speedflow Communications VoIP class 4/5 softswitches with integrated billing, transcoding, SIP-H.323 converter.

3. VoIP phone - Wikipedia

   en.wikipedia.org/wiki/VoIP_phone

   STUN is used in some of the sip phones to enable the SIP/RTP packets to cross boundaries of two different IP networks. A packet becomes unroutable between two sip elements if one of the networks uses private IP address range and other is in public IP address range. Stun is a mechanism to enable this border traversal.

4. 3CX - Wikipedia

   en.wikipedia.org/wiki/3CX

   3CX produces a telephone system under the same name. The system consists of a number of software-based [13] components. It can be accessed via a Web Client, PWA, Desktop App, Management & Admin consoles, softphone for Windows, and smartphone clients for iOS and Android. 3CX can be used with either SIP phones or the clients, or a combination of ...

5. oSIP - Wikipedia

   en.wikipedia.org/wiki/OSIP

   oSIP is a free software library for VoIP applications implementing lower layers of Session Initiation Protocol (SIP). The library includes the minimal codebase required by any SIP application and offers enough flexibility to implement any SIP extension or behavior.

6. List of SIP response codes - Wikipedia

   en.wikipedia.org/wiki/List_of_SIP_response_codes

   SIP requests and responses may be generated by any SIP user agent; user agents are divided into clients (UACs), which initiate requests, and servers (UASes), which respond to them. [ 1 ] : §8 A single user agent may act as both UAC and UAS for different transactions: [ 1 ] : p26 for example, a SIP phone is a user agent that will be a UAC when ...

7. Avaya 1100-series IP phones - Wikipedia

   en.wikipedia.org/wiki/Avaya_1100-series_IP_phones

   The 1120SA is a special-use phone which is certified for use by Sensitive Compartmented Information Facilities (SCIF) users, without an external device. [3] [4]The National Telecommunications Security Working Group (NTSWG) has approved the Avaya IP Phone 1120SA for deployment under the Director of Central Intelligence Directive (DCID 6/9), for VoIP and VoSIP (TSG-6 Type-acceptance CNSS Class-A ...

8. Linphone - Wikipedia

   en.wikipedia.org/wiki/Linphone

   Linphone (contraction of Linux phone) is a free voice over IP softphone, SIP client and service. It may be used for audio and video direct calls and calls through any VoIP softswitch or IP-PBX . Linphone also provides the possibility to exchange instant messages.

9. SIP provider - Wikipedia

   en.wikipedia.org/wiki/SIP_provider

   A SIP provider (Session Initiation Protocol) is any telecommunications company which provides SIP trunking to customers, usually businesses. Many companies provide SIP "termination" (outbound calling) and "origination" (inbound calling, usually with a plain old telephone service (POTS) phone number, called a direct inward dialing (DID).