Grandstream Networks HT502 User Manual page 18

LED Indicators
Reset Button
Voice over Packet
Capabilities
Voice Compression
DHCP Server/Client
Telnet Server
Fax over IP
QoS
IP Transport
DTMF Method
IP Signaling
Provisioning
Control
Device Management
Power, WAN, LAN, PHONE1 and PHONE2
Factory Reset button
Voice Activity Detection (VAD) with CNG (comfort noise generation) and PLC
(packet loss concealment), Dynamic Jitter Buffer, Modem detection & auto-
switch to G.711, Packetized Voice Protocol Unit (supports RTP and AAL2
protocol), G.168 compliant Echo Cancellation, LEC (line echo cancellation) with
NLP, Asymmetric RTP stream
G.711 + Annex I (PLC), Annex II (VAD/CNG format) encoder and decoder,
G.723.1A, G.726(ADPCM), G.729A/B/E, iLBC, G.726 provides proprietary VAD,
CNG, and signal power estimation, Voice Play Out unit (reordering, fixed and
adaptive jitter buffer, clock synchronization), AGC (automatic gain control),
Status output, Decoder controlling via voice packet header
Yes, NAT Router or Switched Mode
Yes
T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for
Fax Pass-through, Fax Datapump V.17, V.19, V.27ter, V.29 for T.38 fax relay
Diffserve, TOS, 802.1 P/Q VLAN tagging
RTP
Flexible DTMF transmission method, user interface of In-audio, RFC2833,
and/or SIP Info
SIP (RFC 3261)
TFTP, HTTP, HTTPS
TLS/SIPS , SIP over TCP/TLS
Web interface or via secure encrypted AES or non-encrypted central
configuration file for mass deployment, Auto/manual provisioning system or via
HT502 User Manual
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