One Chunnel GSM VoIP Gateway
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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)
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