Session Border Control in Enterprises
The mass adoption of IP-based voice and video services is now being
driven by improvements in quality and features, in addition to the
well-known cost advantage.
For the enterprise market, reliability and security are key factors.
These present growing challenges as traffic volumes over all network links
(internal, inter-site, and Internet) rise.
Enterprises also need to offer their staff a consistent experience whether
they are in the office, at home or on the road. This mobility requires deep
integration into the global next generation telecommunication network –
blurring the boundary between the enterprise and carrier networks.
As a result, enterprises are increasingly deploying Session Border
Controllers (SBCs) to protect their network border and retain control of
this new network environment. For example, Infonetics reports that the
enterprise session border controller market bucked the overall negative
spending environment to grow more than 50% in 2009 over 2008.
By deploying Session Border Controllers, enterprises can ensure QoS for
business-critical services, protecting sensitive data and servers, and
optimizing costs through fine-grained access policy, per-user limits, and
Session Border Controllers enable the use of otherwise incompatible devices
and services, so minimizing disruption and upgrade cost when rolling out new
services. SBCs can interwork between enterprise services (e.g. PBX), carriers
(IMS or non-IMS), hosted services, other third-parties and a wide range of
client devices. For example, SBCs can enable an H.323 based conferencing
server to support SIP phones and tunnel services through NATs and firewalls.
Session Border Controllers also include extensive monitoring capabilities to
enable reconciliation with carrier charges, for management accounting, and to
record usage for compliance.
Metaswitch has extensive experience in supplying Session Border Control
(SBC) software products to communications equipment manufacturers, enabling
them to build SBC products that meet enterprise requirements.
Features and Benefits
The Metaswitch Session Border Controller solution for IMS offers the
following features and benefits.
- Protects from malicious and faulty devices – controlling signaling access
to the enterprise network, and normalizing signaling traffic (call attempt rate
limits, concurrency limits (number of calls, bandwidth requirements),
ANI / DNIS).
- Controls routing of traffic to peer networks and subscribers, including
prioritized location-aware handling of emergency calls.
- Maximizes usable capacity of shared-usage, bandwidth-constrained links using
flexible enterprise-configured policy to apply QoS marking, bandwidth limits
and prioritization to signaling and media traffic based on numerous inputs
including: end-user identity, network loading, and resources requested.
- Enforces privacy of operator and customer information – strips private
headers from messages leaving the core, enforces security policy on trusted
and untrusted links, provides NAT for private to public address mapping, and
- Monitors usage and generates billing records for the media resources used
by each call – the billing records are cached locally in the event of
failure to contact a billing server.
- Supports wire-tapping by national intelligence agencies.
- Enables interworking with non-IMS carriers, enterprises and end-users,
including H.323 / SIP interworking, DTMF and codec interworking, and NAT and
- Supports multiple standard profiles e.g. IMS, SIP, H.323, including
interworking between variants, extended with multi-layer policy rules and
flexible customization options to support non-standard requirements.
- Provides a multi-stage policy engine to control media and signaling flows
per user / user group / source / destination.
- Supports NAT, NAT traversal, codec interworking, and media policy enforcement.
- Delivers carrier-class scalability, performance and high availability –
maintaining active calls over failover and in-service upgrade of signaling
and media components.
- Scales to hundreds of thousands of concurrent calls and millions of BHCAs
with integrated and distributed deployment models, including optimized multi-core
and multi-processor support.
The Metaswitch Session Border Controller solution for IMS is based on the
- DC-SBC is a fully portable source-code Session Border Controller solution for
- DC-SIP is a robust, high function, flexible, portable Session Initiation
Protocol (SIP) toolkit.
- DC-Diameter is a flexible, portable source code implementation of the Diameter
Authorization, Authentication and Accounting (AAA) protocol.
- DC-MGCP/Megaco is a complete, scalable, and fault-tolerant source code
implementation of the MGCP and Megaco/H.248 protocols.
- High Availability Framework (HAF) - Metaswitch's architecture for delivering
fault tolerance and reduced downtime across the range of network protocols.
- N-BASE - Metaswitch's portable operating environment for network protocols.
- Metaswitch professional services,
support directly from the
Metaswitch engineering organization.
 "Enterprise SBC Market
Outlook", Infonetics Research, July 2010