SIP proxy


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SIP proxy

(Session Initiation Protocol proxy) A proxy server that allows SIP-based telephony packets to traverse the network's firewall. The SIP proxy takes over call control and provides address translation in order to direct calls to the appropriate phones within the network. Deployed in companies with many SIP phones, a SIP proxy offers a very comprehensive solution for enterprises. For example, it supports authentication, encryption, telecommuters and can even serve as backup for the PBX.

Stateless vs. Stateful
A stateless SIP proxy establishes the connection and gets out of the way. A stateful SIP proxy keeps track of the call and supports more sophisticated functions such as call routing and caller filtering. See SIP ALG, SIP and proxy server.
References in periodicals archive ?
In the proposed SeSIP, SIP is the main protocol to manage the session between MN, SIP-NVG, SIP Proxy 1, SIP Proxy 2, and CN.
Statistical features of time intervals between SIP signalling messages arriving to SIP Proxy server (SIP PS) moments obtained during the experiment are presented in this work.
When an SIP proxy server receives a request message related to a call-disruption attack, it sends an Ext-INFO request to the UA that sent the message.
The Proxy7 Signaling Gateway bridges the gap between VoIP networks and the PSTN with combined SIP Proxy Server and SS7/C7 Signaling, enabling VoIP Providers to cost-effectively terminate SIP-based voice traffic onto the PSTN.
All HelloSoft VoIP products are standard compliant and have been tested for interoperability with commercial SIP proxy servers and popular IP phones.
The solution provides an added layer of security for SIP proxy servers, IP-PBXs, and real-time communications systems from market leaders and open-source vendors.
The softswitch, which integrates a complex SIP Proxy component, can be readily integrated into existing infrastructure from leading vendors including Cisco, Nortel and others.
Signaling message handling times and distributions determining the SIP service agent during the experiment station were installed software "OpenSER", which performs the SIP proxy server unit (SIP PS) functions.
The SIP user agent (UA) transmits an INVITE request message to the receiver UA in order to create a session via the SIP proxy servers.
For example, RFC 2617 was introduced to support SIP digest authentication that prevents unauthorized access to a SIP proxy's services.
BandTel's N-Plus network is based on several pairs of DNS servers that direct the SIP calls to SIP Signaling Transfer Points (STPs), which in turn direct those SIP call on one of "N" SIP proxy's in the BandTel SIP proxy matrix.