Grandstream GXW4104 4‑Port FXO VoIP Gateway

Key Features:

• 4 × FXO Ports (RJ11): Connect up to four analog PSTN lines to your VoIP/IP PBX system.

• Dual 10/100 Mbps Ethernet: Two network ports for WAN/LAN connectivity.

• Flexible SIP Support: Compliant with SIP (RFC 3261) for broad VoIP interoperability.

• Wide Codec Support: Includes G.711 (μ/a‑law), G.723, G.726, G.729A/B/E, G.728, and iLBC for high‑quality voice.

• T.38 Fax Support: Fax‑over‑IP support with auto‑fallback to G.711 for reliable fax.

• PSTN Failover: Automatic PSTN lifeline failover in case of VoIP network failure.

• Echo Cancellation & Jitter Buffer: G.168 echo cancellation and dynamic jitter buffer for clear calls.

• Caller ID & Telephony Features: Caller ID formats (Bellcore/ETSI/NTT/BT), flexible dial plans, multiple SIP accounts per port.

• Secure & Managed: SRTP/TLS for encrypted calls; web GUI, HTTP/HTTPS, TFTP, and syslog for provisioning and management.

• Flexible Mounting: Wall or desktop placement with compact footprint.

Hardware & Technical Specs:

• FXO Interfaces: 4 × RJ11 FXO analog PSTN ports.

• Network: 2 × 10/100 Mbps RJ45 for WAN/LAN.

• Voice Codecs: G.711, G.723, G.726, G.729A/B/E, G.728, iLBC.

• Fax: T.38 compliant Group 3 fax relay + G.711 pass‑through.

• DTMF Methods: In‑audio, RFC2833, SIP INFO.

• SIP Profiles: Up to 2 distinct SIP server profiles with independent SIP accounts per port.

• QoS: DiffServ, TOS, 802.1p/Q VLAN tagging.

• Security: SRTP, TLS/SIPS for secure media and signaling.

• Provisioning: HTTP/HTTPS/TFTP; management via web GUI, Telnet, syslog.

• Power: 12 V DC input (adapter included).

• Environmental: Operating 0 °C–40 °C; humidity 10 %–90 % non‑condensing.

• Dimensions & Weight: Approx. 230 × 135 × 35 mm (L×W×H); lightweight enclosure.