Grandstream GXW series

Grandstream's GXW gateways bring analog phone lines into Exovo — the GXW-4104 (4 FXO ports) and GXW-4108 (8 ports) are the workhorses for keeping copper lines alive on a modern system.

Adding the gateway

Admin → Trunks → Add gateway, choose the Grandstream GXW template, and set:

• Port count — matches the model (4 or 8).
• Caller-ID scheme — the regional signaling standard (Bellcore for North America, ETSI-FSK variants for Europe, NTT for Japan, and more). Wrong scheme = no inbound caller ID.
• Fax mode — T.38 relay (preferred where lines support it) or G.711 passthrough.
• Call-progress tones — dial/ringback/busy per your country, so the gateway detects hangups and dial tone correctly.

Exovo generates the gateway's SIP identity and one inbound number per FXO port, then renders the device configuration in Grandstream's native binary format; point the GXW's config server at your provisioning URL and it pulls everything and registers into the system.

Routing

Each analog line lands like any other inbound call: give the gateway a default route or build inbound rules per line. Outbound, add the gateway to an outbound rule's trunk chain — analog lines are the classic last-resort failover route when the internet is down. The hunt mode setting picks which port carries an outbound call (fixed order or round-robin).

Notes

• Echo cancellation and silence suppression come enabled by the template — leave them unless a specific line misbehaves.
• Analog line quality varies; if callers report one line sounding worse, swap which physical line feeds which port to isolate line vs port.