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The term "controller" refers to the influence that session border controllers have on the data streams that comprise sessions, as they traverse borders between one part of a network and another. Additionally, session border controllers often provide measurement, access control, and data conversion facilities for the calls they control.
NAT traversal with SBC during user registration. Similar to the registration case, the SBC will also include itself in the path of INVITE and other request messages. When receiving an INVITE from a user agent behind a NAT, the SBC will include a via header with its own address, replace the information in the contact header with its own address and also replace the address information in the ...
4 Session border controllers. 5 Enabled firewalls. 6 Libraries. 7 Test tools. 8 See also. 9 References. ... Cisco SIP Proxy Server, Cisco unified border element (CUBE
Establishment of a session through a back-to-back user agent. Session border controllers (SBCs) serve as middleboxes between user agents and SIP servers for various types of functions, including network topology hiding and assistance in NAT traversal. SBCs are an independently engineered solution and are not mentioned in the SIP RFC.
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A back-to-back user agent (B2BUA) is a logical network element in Session Initiation Protocol (SIP) applications. [1] SIP is a signaling protocol for managing multimedia Voice over Internet Protocol (VoIP) telephone calls. A back-to-back user agent operates between both end points of a communications session and divides the communication ...
[1] [2] BRAS can also be referred to as a broadband network gateway or border network gateway (BNG). [3] The BRAS sits at the edge of an ISP's core network, and aggregates user sessions from the access network. It is at the BRAS that an ISP can inject policy management and IP quality of service (QoS). The specific tasks include:
Click here to download electronic copies all four Sonus reference guides: Lync Enterprise Voice for Dummies, SIP Trunking for Dummies,Session Border Controllers for Dummies and Session Management ...