SO Module(1 FXS & 1 FXO Ports): 

Unique PSTN Fallback Function! Make/receive calls even when system powers down. 

S2 Module(2 FXS Ports): 

The S2 is a module with 2 FXS ports to terminate two analog telephone.

O2 Module(2 FXO Ports): 

The O2 is a module with 2 FXO ports to terminate two analog PSTN(POTS) lines.

TDM800

TDM800 is designed to fully support Zaptel compatible hardware. You need only to add the corresponding Driver Module on Asterisk Software, and no need to change any code of Asterisk.

• Much better than TDM400P in quality & stability, and save almost 50% money. 

• 100% compatible with Asterisk, and run as good as TDM400P. 

• Timely technical support and services are available, 3 years warranty. 

• Provide windows driver & SDK, protect user investment if changing OS platform in the future. 

• Specially provide SO Module - Unique PSTN Fallback Function. It means when Asterisk down, user call also use the PSTN line. 

• Intuitive LED, Red light for FXO port and Green light for FXS port. 

• Already got CE/FCC/MIC certification. It is a mature product with stable performance.

• Easy to install, no training required - See more at:

O2 Module(2 FXO Ports)

S2 Module(2 FXS Ports)

S2 Module(2 FXS Ports)

S2 Module(2 FXS Ports)

B2 Module(2 BRI Ports)

GSM Module(1 GSM Port)