PORTech is the original manufacturer in Taiwan with 39 years; therefore we’ll do our best to offer the best service and support PORTech major 1/2/4/8/16/32 ports VoIP GSM/UMTS/3G Gateway SIM Server SIM Bank IP Audio Gateway IS-381 : 1 port IP Audio Gateway. (No AMP). IS-382 : 2 ports IP Audio Gateway (No AMP). IS-3840: IP Audio Gateway(include AMP). IP Speaker IS-640 : IP wall Speaker IS-640P : IP wall (POE) Speaker IS-650: IP Horn (POE) speaker IS-660: IP Ceiling (POE) Speaker IS-670: IP Wall Mount (POE) Speaker IP Broadcasting System 1/4/8 ports GSM Fixed Wireless Terminals(Follow Me GSM Gateway) http://www.portech.com.tw