Grandstream Networks HT503 User Manual page 13

DHCP Server/Client
Audio Features
Call Handling Features
Network and
Provisioning
Fax over IP
Security
Physical Design
FIRMWARE VERSION 1.0.9.1
Yes
Advanced Digital Signal Processing (DSP)
Dynamic negotiation of codec and voice payload length
Support for G.723, G.729/E, G.711, G.726-40/32/24/16, iLBC, T.38 codecs
In-band and out-of-band DTMF (in audio, RFC2833, SIP INFO)
Silence Suppression, VAD (voice activity detection), CNG (comfort noise generation),
ANG (automatic gain control)
Adaptive jitter buffer control
Packet delay & loss concealment (PLC) & G.168 compliant Line Echo Cancellation
Support volume amplification
Support configurable Call Progress Tones
Caller ID display or block, Call waiting caller ID, Call waiting/flash, Call transfer, hold, call
forward, do not disturb, 3-way conferencing
Manual or dynamic host configuration protocol (DHCP) network setup; RTP and NAT
support traversal via STUN
T.38 compliant Group 3 Fax Relay up to 14.4kpbs and auto-switch to G.711 for Fax
Pass-through, Fax Data pump V.17, V.19, V.27ter, V.29 for T.38 fax relay
DIGEST authentication and encryption using MD5 and MD5-sess
Stylish and compact design; small universal power supply, ideal for travel
HT503 USER MANUAL
Page 13 of 59