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HT503 GRANDSTREAM GrandStream s Hybrid VoIP Adapter with 2 Ports (FXS/FXO) HT-503
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HT-503 GRANDSTREAM GrandStream s Hybrid VoIP Adapter with 2 Ports (FXS/FXO)

The HT503 is an analog telephone adapter featuring 1 analog telephone FXS port and 1 PSTN line FXO port in order to offer backup lifeline support using a PSTN line. The integration of a FXO and FXS port enables remote call origination and termination to and from the PSTN line known as hop-on and hopoff calling. The 1 FXS port allows for extension of a VoIP service to 1 analog phone. 


- 2 FXS (RJ-11) ports for the connection of conventional analog phones.

- Network port LAN and WAN 10/100 Mbps (RJ-45).

- LED indicators for phone 1 phone 2 LAN and WAN.

- Reset button.

Voice fax and modem:

- 2 Lines (SIP profiles) and 3 way conference.

- Telephone functions: call transfer call forward call-waiting do not

disturb message waiting indication multilanguage promtps flexible dial plan and more.

- Fax over IP: Compatible with protocol T.38 for Fax up to 14.4 kbps.

- Voice codecs: G.711 (I and II) G.723.1A G.729A/B/E G.728 and G.726.

Administration and Security:

- Failover in case connection is lost with the main SIP server it automatically changes to the secondary server.

- Compatible with SYSLOG Telnet and remote managemend via web browser.


- QoS Layer 2 (802.1Q 802.1P) and QoS Layer 3 (ToS Di Serv MPLS).


FCC (Part 68 & 15B) C-Tick AS/NZS CISPR22 CISPR24 CE EN55022 EN55024 TBR21 EN60950 EN61000-3-2 EN61000-3-3 UL (power supply).

Physical and Electrical Characteristics:

- Supported temperature range: 0 °C up to 40 °C.

- Power supply: 12 Vcc 0.5 A

- Dimensions: 115 x 25 x 75 mm.

2024-02-23 11:55:24

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HT503 GRANDSTREAM GrandStream s Hybrid VoIP Adapter with 2 Ports (FXS/FXO) HT-503

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