About

All telecom fundamentals on SIP protocol, VOIP, RTP, RTCP knowledge, Technical Youtube Videos, Linux material, Android, SSCA certification information,the sip school videos.

Thursday 27 September 2012

SBC (session Border Controller) Functions

Functions

SBCs commonly maintain full session state and offer the following functions:
  • Security – protect the network and other devices from:
  • Malicious attacks such as a denial-of-service attack (DoS) or distributed DoS
  • Toll fraud via rogue media streams
  • Topology hiding
  • Malformed packet protection
  • Encryption of signaling (via TLS and IPSec) and media (SRTP)
  • Connectivity – allow different parts of the network to communicate through the use of a variety of techniques such as:
  • NAT traversal
  • SIP normalization via SIP message and header manipulation
  • IPv4 to IPv6 interworking
  • VPN connectivity
  • Protocol translations between SIP, SIP-I, H.323
  • Quality of service – the QoS policy of a network and prioritization of flows is usually implemented by the SBC. It can include such functions as:
  • Regulatory – many times the SBC is expected to provide support for regulatory requirements such as:
  • Media services – many of the new generation of SBCs also provide built-in digital signal processors (DSPs) to enable them to offer border-based media control and services such as:
  • DTMF relay and interworking
  • Media transcoding
  • Tones and announcements
  • Data and fax interworking
  • Support for voice and video calls
  • Statistics and billing information – since all sessions that pass through the edge of the network pass through the SBC, it is a natural point to gather statistics and usage based information on these sessions.

0 comments:

Post a Comment

Note: only a member of this blog may post a comment.

Page Navigation Widget