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Grandstream GXW4104
| Type | FXO VoIP Gateway |
| FXO Ports | 4 × RJ11 (connects to landline/PSTN lines) |
| SIP Support | Up to 2 SIP server profiles |
| Network | 2 × 10/100 Mbps Ethernet ports (LAN/WAN) |
| VoIP Protocol | SIP (RFC3261) |
| Audio Codecs | G.711, G.723.1, G.726, G.729A/B, iLBC, GSM (varies by firmware) |
| Fax Support | T.38 fax relay + G.711 passthrough |