TsLink3 ISDN SDK Source Code Stack

TsLink3 ISDN/Q.931/Q.921/DSSI Source Code

TsLink3 Basic Rate ISDN (BRI) and Primary Rate ISDN (PRI) Source Code stacks provide advanced starting points for a wide range of communications products. TsLink3 ISDN Software Development Kits (SDKs) are fully compliant with the ITU-T Q.931 and Q.921 recommendations and with the ETSI ETS 300 125 and ETS 300 403 standards. TsLink3 BRI and PRI software modules have been extensively tested at many conformance centers in Europe, North America, Japan and Australia and deployed worldwide in millions of products.

Available integrated with the TsLink3 Q.931 and Q.921 source code modules are proven software modules for: Multi Level Precedence and Preemption, Supplementary Services, AutoSPID, Autoswitch Detection, NFAS, D-Channel Backup and Physical Layer drivers.

High Availability Option

TsLink3 ISDN software supports High Availability (HA) applications for high density switches with multiple modes of HA operation, including the seven key elements of HA. Please refer to the TeleSoft HA White Paper for details. Applications requiring HA will benefit from the TsLink3 stack capacity to support up to 7,900 simultaneous connections and up to 256 ports.

Q.931 Features

ISDN Archetecture

Q.921 Features and Support

ISDN BRI Features and Support

ISDN PRI Features and Support

Typical applications:

  • Signaling Gateways
  • ISDN Terminals
  • Integrated Access Devices (IADs)
  • ISDN telephones
  • Base stations
  • Media Gateways
  • Switches
  • Telephony
  • Test equipment
  • Customer Premise Equipment

TeleSoft Advantages

TsLink3 software stacks are specifically architected for all types of embedded and host-based applications and are optimized for excellent performance and small code size.

Written in ANSI C and delivered as source code SDKs ported to a defined RTOS of your choice, TsLink3 stacks give you an advanced starting point to shorten your development schedule, minimize technical risk and maintain the flexibility to exercise full control over your end product.

All TsLink3 protocol software stacks are based on a Standard Core Architecture (SCA) with a Universal API (UAPI) that enables easy migration between different stacks and portability to different software/hardware platforms.

Universal Application Programming Interface (UAPI) 

TsLink3 code includes a rich message-based Universal API (UAPI) which presents a simple interface for simple applications such as "signaling-only." UAPI also provides the versatility and power needed to support more complex configurations which combine signaling with data protocols or with specialized hardware. The TsLink3 Universal API coupled with the straightforward structure of the TsLink3 protocol stack enables you to easily follow the API message flow through the code to determine where to make modifications required for your application. 

The majority of simple signaling-only applications require a very small subset of the TsLink3 API messages and parameters - and the non-applicable messages can be disregarded and unused parameters set to zero. More complex applications benefit from the large set of messages and parameters that we provide as templates. 

UAPI is common across all TeleSoft stacks which decreases the time and effort required to add upgrade modules to an existing TsLink3 stack and to develop with additional TeleSoft stacks.

UAPI-to-Custonmer Application

Software Tools

Internal Protocol State Logging Tool and Debugging Tool are invaluable aids during portation and integration, included with every TsLink3 stack at no additional charge.

Upgrade and Individual Modules

Completing the solution are upgrade- and individual-modules that increase your market opportunity by increasing your products' connectivity capabilities. Modules include High Availability, PPP, ML-PPP, X.25, MLPP, Frame Relay, T1 RBS, E1 CAS, R2, V.120, and Supplementary Services.

Purchasing TsLink3 Software

TsLink3 Source Code is supplied in comprehensive, portable packages of 'C' source code modules and interfaces necessary to develop robust products. Source Code packages provide source code from Layer 1 device driver software up through the Layer 3/Layer 4 interface of the OSI model. Cost-effective one-time licensing fee; no royalties or user-fees for TsLink3 source code.

Well-Structured, Maintainable Code

Maintainability and scalability are designed into each TsLink3 stack. Comprehensive comments and documentation support you as your product goes forward. The value of TsLink3 stacks will be evident in each phase of your engineering schedule and the product life span.

Shorter Learning Curve & Faster Customization

Faster debugging

Smaller inventory


Comprehensive documentation customized for your load. Provided in a searchable soft format. All nomenclature complies with ITU-T.

Technical and Custom Support

3-months included with each license. 12-month maintenance extensions include code updates and quick-response technical support via E-mail, phone and fax.