SIP Blog - Page 5

A mini perl based SIP proxy Currently the source provided is just an example of how to use perl-POE making it act as a SIP proxy. Nevertheless: It can act as a local PBX so all registered parties…

PRACK is defined in RFC 3262: Reliability of Provisional Responses in the Session Initiation Protocol (SIP) The PRACK request plays the same role as ACK, but for provisional responses. There is an important difference, however. PRACK is a…

SIPGATE Germany SIPGATE United Kingdom VOIP to PSTN as well as PSTN to VOIP service provider (voicemail is planned and in Germany available as a test). Subscribers to this service get a public phone number that people can…

User Agent Server-In VoIP, a server application in an SIP system that accepts the requests from a UAC and generates an accept, reject or redirect response on behalf of the user. The combination of the UAC and the…

From the SIP RFC: Outbound Proxy: A proxy that receives requests from a client, even though it may not be the server resolved by the Request-URI. Typically, a UA is manually configured with an outbound proxy, or can…

From the SIP RFC: Registrar: A registrar is a server that accepts REGISTER requests and places the information it receives in those requests into the location service for the domain it handles. SIP offers a discovery capability. If…

minisip 2008-11-25: Project appear abandoned – last activity in June 2006 minisip is a SIP soft phone for Linux, Windows XP and soon Windows Mobile 2003 SE that implements additional security features such as mutual authentication, encryption and…

From RFC 3261 SIP provides a stateless, challenge-based mechanism for authentication that is based on authentication in HTTP. Any time that a proxy server or UA receives a request (with the exceptions given in Section 22.1), it MAY…

Intercepting SIP Calls The following discussion applies solely to VoIP using the SIP protocol. H.323 and MGCP are widely used, but they present different isuues when considering call interception. Many ITSP’s are being confronted with the requirement that…

The SIP REFER method is described in RFC 3515 which says in part: This document defines the REFER method. This Session Initiation Protocol (SIP) extension requests that the recipient REFER to a resource provided in the request. It…

See Sipp SIP: The protocol Protocol Verification and Testing

Sipp is a performance tester for the SIP protocol. It comes with a few basic SipStone user-agents scenarios (UAC & UAS), establishing and releasing multiple calls with the INVITE and BYE methods. Asterisk configuration for SIP (non-rtp listening)…

https://www.centile.com From website: Founded in 1998, Centile Telecom Applications is the leading European developer of unified communications platforms for operators. The Centile Any3 architecture – Any service, over Any network, on Any terminal – addresses the needs of…