The 4-port GSM Gateway provides the extension of VOIP1 and supports up to 4 GSM channels

 The 4-port GSM Gateway (JG-VoIP4) provides the extension of JG-VoIP1 and supports up to 4 GSM channels.  Each GSM channel can be programmed individually to establish the connectivity with IP-PBX, or can be bundled as a single trunk in connection with IP-PBX.  It is ideal for VoIP to wireless services where a fixed telephone line (PSTN) is not available or for cellphone roaming via the a VoIP network. The GoIP4 brings mobility, scalability and significant savings on long distance charges.