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VOPTech Document Four Channel’s GSM VoIP Gateway

1 Product Introduction

1.1 General Information

A VoIP GSM Gateway enables direct routing between IP and GSM network without the use

of a FXO port or the PSTN network. With this device, the usage of VoIP is greatly

enhanced with significant savings on long distance and roaming charges.

1.2 Protocol

¾ TCP/IP V4 (IP V6 auto adapt)

¾ ITU-T H.323 V4 Standard

¾ H.2250 V4 Standard

¾ H.245 V7 Standard

¾ H.235 Standard（MD5，HMAC-SHA1）

¾ ITU-T G.711 alaw/ulaw, G.729A, G.729AB, and G.723.1 Voice Codec

¾ RFC1889 Real Time Data Transmission

¾ Proprietary Firewall-Pass-Through Technology

¾ SIP V2.0 Standard

¾ Simple Traversal of UDP over NAT (STUN)

¾ Web-base Management

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