Portech Products:
Portech VoIP GSM Gateways (SIP GSM/CDMA/UMTS)
Portech GSM Fixed Wireless Terminal (Analog Line)
Portech Free Romaing Gateway
Portech E1/VoIP GSM Channel Bank
Portech SIM Server
Portech Antenna Combiner
Portech VoIP GSM PCI Card

Portech VoIP Solutions : http://www.portech.de