Documented specifications
Grandstream · Manufacturer documentation available at review; exact SKU availability, remaining support period and approved firmware not established.
| Specification | Documented value |
|---|---|
| Analog interfaces | 16 FXS RJ11 ports and a Telco connector Source ↗ |
| FXO ports | None; this model terminates analog subscriber devices Source ↗ |
| Network | One 10/100/1000 Mbps RJ45 port Source ↗ |
| SIP profiles | Four per system; separate SIP account per port Source ↗ |
| Fax | T.38 and G.711 pass-through options documented Source ↗ |
| Security | TLS, SRTP and secure boot described for the v2 series Source ↗ |
Unlisted fields remain unverified. Platform compatibility and remaining support life require confirmation for the exact ordered model.
Keep FXS and FXO distinct
The GXW4216 v2 presents sixteen FXS subscriber ports for analog telephones or suitable fax equipment. It is not an FXO interface for plugging public telephone lines into a PBX. The series datasheet lists one Gigabit network port and four SIP server profiles per system with an independent SIP account per telephone port.
Map the ports before migration
Label each legacy endpoint, extension, physical jack and power dependency. Move a limited group first and verify inbound caller ID, ring cadence, DTMF, disconnect supervision and emergency calling arrangements. A sixteen-port appliance concentrates more extensions into one outage domain than a single-line ATA.
Fax and provisioning need their own tests
The manufacturer documents T.38 and G.711 fax options, plus TR-069 and file-based provisioning. Neither is proof that the actual carrier and fax machines will interoperate. Send and receive representative multi-page documents and retain failure logs.
Secure the appliance
The v2 product material lists TLS/SRTP, HTTPS, secure boot and randomized default admin passwords. Confirm the shipped hardware revision and current firmware, remove unused access and check the PBX’s trusted credential and certificate settings. Stock and support period remain to be confirmed for the order.
Sources & applicability
Primary references for the technical details above. Operational examples and planning checklists are VoIP.info editorial guidance.
- Grandstream GXW4216 v2 FXS gateway product documentation ↗
- Grandstream GXW4200 series v2 datasheet ↗
- Grandstream GXW42xx V1/V2 user manual ↗
Examples require adaptation to your topology. No live PBX or hardware testing is claimed.