Grandstream Networks HT503 FXS/FXO Manuel D’Utilisation

 

The HT503 is an affordable, high-quality, integrated IP telephony solution for both the residential 
customers and the ‘road-warriors’ who need advanced call features between traditional PSTN network 
and IP network. The HT503 enables IP connectivity for any phone or fax using the FXS port and a web-
based GUI for easy configuration and installation. It functions as a true FXO gateway that enables remote 
call origination and termination from/to PSTN and supports the feature of “hop-on/hop-off” using the 
programmable FXO port. 
 
The HT503 features 2 SIP account profiles and supports advanced telephony features including caller ID, 
call waiting, call transfer, 3-way conferencing (with either IP or PSTN calls), and multi-language voice 
prompts. From a technical standpoint, the HT503 offers a power-outage survivable life line and internet-
disconnect survivable fail-over-to-PSTN support, dual 10/100Mbps Ethernet ports with integrated high-
performance NAT router, a flexible dial plan and a broad range of popular voice codecs.  

1 FXS telephone port (RJ11, 1 FXO PSTN line port (RJ11) with lifeline support 

Two (2) 10M/100 Mbps ports (RJ45) with integrated Nat router 

TCP/UDP/IP, RTP/RTCP, HTTP/HTTPS, ARP/RARP, ICMP, DNS, DHCP, NTP, TFTP, 
PPPoE, STUN & TELNET protocols 

Power, WAN, LAN, PHONE, and LINE 

Factory Reset Button 

Device Management  

Web interface or via secure (AES encrypted) central configuration file for mass 
deployment 

 

Support device configuration via built-in IVR, Web browser or central configuration file 
through TFTP or HTTP 

 

Support Layer 2 (802.1Q, VLAN, 802.1p) and Layer 3 QoS (ToS, DiffServ, MPLS) 

  

Auto/manual provisioning system 

  

NAT-friendly remote software upgrade (via TFTP/HTTP) for deployed devices including 
behind firewall/NAT 

  

Syslog support 

Yes 

Advanced Digital Signal Processing (DSP) 

Dynamic negotiation of codec and voice payload length 

Support for G.723.1A, G.729A/B/E, G.711, G.726-40/24/16,  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 (pending), 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 

Grandstream Networks, Inc. 

Page 7 of 35