Product Introduction; General Information; Protocol - DBL Technology HTM series User Manual

http://www.DBL.com

1. Product Introduction

1.1 General Information

HTM series VoIP gateways are the performance Gateway of FXO plus FXS, which developed by
Technology Co., Ltd. HTM Series VoIP gateways built-in H.323 and SIP protocols. The lines can
be configured into different numbers or used for Trunk Gateway. Highly reliable line detection
prevents the line hanging death in the largest tent. 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 HTM series products，it is the first choice of PXS Manufacturers, Call Center and
System Integrators.
HTM series mainly include HTM-112, HTM-222, and HTM-442.

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 Info
FXS+FXO Gateway Series
45