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3. LSW-504R:
. TCP/IP V4
. ITU-T H.323 V4 Standard
. H.225 V4 Standard
. H.245 V7 Standard
. H.235 Standard（MD5，HMAC-SHA1）
. ITU-T G.711 Alaw/Ulaw, G.729A, G.729AB, G.723.1 and GSM 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
. HTTP
. Dynamic Host Configuration Protocol (DHCP)
. Domain Name System (DNS)
. User account authentication using MD5
. Out-band DTMF Relay: RFC 2833 and SIP Info
Key Features
. 4 Analog phone connections for VoIP services
. PPPoE dial up
. DHCP Client
. PBX function for one phone number for multiple extensions
. Programmable for 4 individual VoIP lines
. Call Waiting
. Call Forward
. Call Transfer
. Caller ID / Caller ID on Call Waiting
. T.38 Fax support (in process)
. Multiple Language Support
. Voice Prompts
. Accounting Function
. Built-in HTTP for accessing internal parameters
. Firmware On-line upgrade
. Auto-provisioning
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