Analog Trunking Board
  • Processing Telephony Voice Media and Analog Lines

  • DSP-Empowered for Media Codecs, 16Chs Per Board

  • Widely Used In Legacy Call Center & Analog Networks

With the open access framework, the SHT series is a powerful and versatile analog telephony interface platform with on-board DSP resources to process fax, conferencing and voice-processing. It is designed to provide developers of highly reliable telecommunications systems with an optimized, cost-effective solution that saves cPCI/PCI/USB slots over traditional designs by combining 2~16 analog Loopstart/Subscriberloop connections with DSP-based enhancements such as fax, conference and voice processing capabilities.

Rooted in Synway all-in-one architecture, hardware design of SHT series adopts modular structure to deliver custom products and high application flexibility for developers and integrators. SHT series boards can be installed with specific modules for station, trunk and recording functions and have high analog interface capability to fit to diverse applications needs. The "USB Box" in the SHT Series is handy for setting up 2~4 port systems for application developers and household users.

The SHT series is also supported by Synway’s in-house unified API that is operating systemindependent, which makes it highly versatile. With a single, protocol-independent API, programmers can easily and quickly develop applications that run on a variety of telecommunication networks simply by executing protocols on the SHT DSP resources. The in-house unified API unifies application development across all Synway’s CTI and call recording products.

  • Highlights
  • Specifications
  • Resources


  • 2 ~ 16 Analog Ports

Configurable 2 ~ 16 analog Loopstart/Subscriber interfaces with call control and switching in cPCI/PCI/USB slot.

  • Distributed Conferencing

Independent conference resource in each port, support conference recording/monitoring;

DTMF filtering to eliminate DTMF signal in confere nce; configured as interactive conferencing without limit on the number of conferees and conferences of high-density multi-parties.

All-in-One Architecture

Universal port capability supports conference, fax, voice-processing and built-in SHT Series functions to ensure scalability, compatibility, and high performance to leverage developer time and application investment.

In-House Unified API

Protocol-independent API minimizes system development and deployment efforts and feature-rich software development kits support for Windows and Linux

FSK/DTMF Detection

Handle call connection with special algorithm for dialing handing and recognizing caller ID in FSK and DTMF modes.

Real-Time Monitoring

Real-time monitoring by audio jack for any of the channels in teleconferencing without need of an additional channel.

Built-in Voice-Processing Resource

Support: A-law, µ-law, record/playback of Windows WAV file, programmable tone generation/ reception/ detection for DTMF, FSK receiver/transmitter, adaptive echo cancellation and barge-in functionality.

Fax Resource

Cover all IVR voice functionality, 4, 8 or 12 ports of DSP based Group 3 fax resources available; transmission speed up to 14400bps; support .TIF file, fax transmission of all kinds of printable files, easily viewed and printed; faxing capacity is software configurable.

Rich DSP Resources

Used to implement call control, switching, and enhancements such as voice playback/record, DTMF/MF, call progress functions , echo cancellation, fax, conferencing; DSP resources are efficiently managed to minimize host overhead and maximize host processing time.

Switching Bus

Full-speed H.100/H.110 bus with 4,096 timeslots to support interoperability with other boards in openarchitecture, high-capacity systems.


Usable with digital boards from other companies such as Digium and OpenVox 

Smooth connection with EXCEL, HARRIS, NORTEL, HUAWEI, ZTE, etc. 

Standard 1U chassis 

Elegant and durable shell made of strong aluminium alloy 

All-in-one design 

Built-in ringing current and battery feed power 

Real-time monitor/play 

E1 trunk interface (RJ45) 

Analog interface (RJ11) or cable interface (RJ21) 

Large capacity: Up to 30 analog station interfaces per system 

CAS support 

Clear Channel Signaling support 

SIG_FXOLS support