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What Is It for?

With the ABC session border controller (SBC) VoIP service providers and enterprises deploy a scalable session border controller (SBC) that was designed to run on top of high end hardware as well as appliances and virtual machines. Thereby, the ABC SBC enables VoIP providers to gradually scale up their infrastructure and covers the needs of enterprises of all sizes.

The ABC session border controller not only offers secure session border control, signaling mediation and call routing but also advanced media server applications. This makes the ABC SBC the perfect tool for addressing the rapidly changing business and network requirements of VoIP and NGN service providers.

In Short, the ABC SBC Provides:

Manage multiple SBCs from a central location

Enable announcements and transcoding directly on the SBC

Support recording using SIPREC

Reduce the load on your network by using Registration offloading

Limit the number of calls, bandwidth & codecs used to prevent fraud & denial of service 

SNMP alarms and status information

High availability using active/hot standby mode

Use the ABC SBC as a VoIP  load balancer

MS-Teams Direct Routing

Deploy on


hardware or VM

Up to 5000 simultaneous calls on off-the-shelf


ABC Platform


A Scalable Session Border Controller


Central Management

The Cluster Configuration Manager (CCM) provides the administrator with an intuitive interface for  

  • Managing the life cycle of the SBC configuration duration: Define, load and modify 

  • Manage multiple SBC from a central location

  • Backup and restore the configuration of an SBC

Media Applications

The ABC SBC provides a built-in programmable and open media server platform for supporting announcements and real-time web applications.

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Generate announcements directly on the border of the network instead of using a dedicated announcement server.

Enable  software based transcoding with support of G711u/a, G726, GSM, iLBC, L16, G722, Speex.

Record SIP calls and save the recorded content either to a dedicated recording server using SIPREC or on local disk.

Border Security

Secure the Border of your VoIP network using:


Rate Limiting

Limit the number of parallel calls and call attempts as well as the bandwidth used by the media streams.


Content Control

Filter the content of incoming SIP messages and drop messages that contain suspicious content.


Topology Hiding

Hide all information related to the VoIP internal structure such as IP addresses of media servers or SIP registrars.


Media Control

Reject media packets that do not conform to the type that was signaled in the session establishment.

Communication Tower

Registration Offload

In order to reduce the number of registrations that have to be processed at the operator’s registrar, the ABC SBC caches successful registrations. The registration information at the operator’s registrar will be refreshed by the ABC SBC at much lower rates than the subscribers refresh attempts.  This reduces the load on the operator’s infrastructure and protects it from misbehaving subscribers or malicious users that try to attack the network by sending large numbers of registration messages.

Direct Routing for MS Teams

Microsoft Teams Direct Routing enables Teams customers to connect to local PSTN or SIP trunk providers using a certified SBC. Direct Routing enables Teams customers to be flexible with respect to their voice infrastructure, allows them to deploy a bring-your-own-carrier/BYOC solution, and sets the stage for coexistence of existing and voice and UC systems.


ABC SBCs support Direct Routing for individual teams enterprise clients as well as different scenarios of multi-tenancy (hosted service provider model). In both cases, ABC SBCs can be deployed as on-premise applications or a virtualized instance


Open Interfaces

The ABC SBC offers RESTfull interfaces that enable a smooth integration with application service platforms. Over its open interfaces a provider can control different features such as:



Offload complex and customized routing logic to an external environment.



Authenticate and register users already on the border of the network.



Control which announcement should be played when.

SIP Session Control and Manipulation

The ABC SBC acts as a SIP Back2Back UA (B2BUA) that enables the operator to control the access to its network and provides the following features:

  • Topology hiding

  • NAT traversal

  • Add, remove and modify SIP headers

  • Manipulate SIP bodies

  • Distribute VoIP calls with round robin or priority based load balancing

  • Route traffic using routing policies, routing tables or external application servers 

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