Product Introduction; General Information; Protocol - DBL Technology HT-912T User Manual

1. Product Introduction

1.1 General Information

FXS Series Gateway are the performance Gateway, which developed by DBL Co. FXS
Series gateways built-in H.323 and SIP protocols. Highly reliable line detection prevents
the line hanging death in the largest tent. Convenient and practical function of a broken
network escape, when disconnect the network, or VOIP logon fails, FXS to mention the
opportunity to jump directly to the outside PSTN. It can forward outside Caller ID
Number under the SIP protocol, which is an important function of PBX application. Super
Echo Cancellation Algorithm and Balanced Circuit make line echo minimum. Low price,
Stable and performance are pronoun of the FXS Series products，it is the first choice of
PXS Manufacturers, Call Center and System Integrators.
FXS Series mainly include HT-912T, HT-922T, HT-842R, HT-882.

1.2 Protocol

TCP/IP V4 (IP V6 auto adapt)

 ITU-T H.323 V4 Standard
H.2250 V4 Standard

H.245 V7 Standard

H.235 Standard（MD5，HMAC-SHA1）

ITU-T G.711 Alaw/Ulaw, G.729A, G.729AB, and G.723.1 Voice Codec

RFC1889 Real Time Data Transmission

Proprietary Firewall-Pass-Through Technology

SIP V2.0 Standard

Simple Traversal of UDP over NAT (STUN)

Web-base Management

PPP over Ethernet (PPPOE)

 PPP Authentication Protocol (PAP)
Internet Control Message Protocol (ICMP)

TFTP Client

 Hyper Text Transfer Protocol (HTTP)
Dynamic Host Configuration Protocol (DHCP)

Domain Name System (DNS)

User account authentication using MD5

Out-band DTMF Relay: RFC 2833 and SIP
