Voice Gateway 4FXS User Manual
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1.2.2 Voice characteristics
Communication protocol: SIP (RFC3261, 3GPP)
Authentication ways: It supports authentication ways of SIP Digest, HTTP Digest
and IMSAKA.
Voice coding: G.711a/u, G.723.1 (5.3kbps/6.3kbps), G.729
Voice quality: voice activity detection (VAD), comfort noise generation (CNG),
Jitter Buffer dynamic adjustment, echo cancellation (complying with ITU-T
G.165/G.168),package loss compensation technology, DTMF detection/generation,
output/input gain control
Dialing rules: It supports E.164 coding rule, custom dialing rule and automatic
search agent server.
DTMF standard: Inband audio, outband over RTP (RFC2833/SIP INFO)
Voice business: It supports hotline telephone, call transfer (forward transfer,
backward transfer) and call waiting.
Three-party services
Safe communication: It supports signal encryption and media encryption.
Billing function: It supports internet access private billing and POTS-standard
reversed polarity signal billing.
QOS support: It supports port priority control, IP TOS and 802.1p/q VLAN
Fax function: It supports T.30 fax, VBD passthrough fax and T.38 fax.
Modem support: It supports Modem business
1.2.3 Network characteristics
Network access: multiple network access modes (static IP, DHCP, PPPoE)
Network protocols: TCP/IP, UDP/IP, ARP/RARP, ICMP, IGMP, Telnet, HTTP, DNS,
DHCP, SNTP, FTP/TFTP and SNMP
Supporting network tools: Ping, Trace Route and Telnet Client
