C15 Call Session Controller

Provides a critical bridge to revenue growth, new IP services, and lower operational costs

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C15 Call Controller

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Columbus Telephone Selects GENBAND's Solution for Ongoing Network Transformation

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Dobson Telephone uses C15 Call Controller to leverage investments

C15 Call Session Controller

Service providers with legacy TDM networks face substantial challenges and risks due to the rapid aging of 25 to 30 year old legacy TDM switches, ongoing line loss, and IP-based competitive alternatives.  Widely-deployed in the smart cores of hundreds of operator networks, the C15 Call Session Controller, part of GENBAND’s Call Controller portfolio of innovative transformation products, reduces these risks by providing a critical bridge to revenue growth and new IP services.

The C15 supports a wide variety of standard protocols, interfaces, and features to concurrently enable both IP and legacy services for Class 5 replacement, including HD voice, Centrex, web portal, mobility, video calling, call logging, integrated voice mail, AMA collection, IP PBX, LNP, E911, and CALEA.  The C15 is also fully SIP and IMS-capable with integrated SIP call session control, session border control, and TDM gateways for seamless inter-working between VoIP and TDM subscribers.

Testimonial: GENBAND C15 Softswitch and SBC

Local Number Portability Feature and More

GENBAND's C15 call controller enables carrier service providers to offer advanced features, including local number portability, directory number hunt, and end office or Access Tandem operation.

Nortel DMS 10, DMS 100 and Legacy TDM Switch Replacement

The C15 reduces CapEx and leverages existing fixed access by connecting to line frames and peripherals of switches such as DMS 10 and DMS 100, as well as MSANs and other IP-based access, enabling operators to effectively discard their TDM switch cores and move customers to the SIP and IMS services cloud.  The C15 provides an easy back office transition, supporting legacy operational interfaces.  A convenient Graphical User Interface allows quick and easy provisioning, and a robust GUI-based portal allows subscriber self-care and advanced voice application control.


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C15 Release 14 Webinar
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call session controller

C15 Call Controller Benefits:

  • Globally-deployed and market-proven, with carrier grade redundancy
  • Economical to 100,000 lines, with convenient and scalable core and port modules
  • Green technology footprint with potential for 90% or greater power savings
  • Advanced IP applications for new revenue including HD voice, softphone clients, one number service with mobility, and unified voicemail
  • Open standards interfaces and extensive CPE and partner interoperability
  • ESA capability allows port modules and gateways to be distributed to remote locations without fear of a cable or fiber cut
  • Simplified web-based OAM with flexible, standards-based OSS and billing


C15 Release 13 & Kandy Webinar!
Watch On-Demand to discover our newly released suite of C15 features and capabilities with release 13. Plus, learn about exciting new Cloud services from Kandy Business Solutions to enhance your offerings!