The SPA921 IP phone is an advanced, affordable, feature rich IP phone for the home office and business. It features comprehensive interoperability and a SIP based feature set.
The SPA921 is a feature‑rich, single‑line IP phone with a 128×64 monochrome graphical LCD, speakerphone, headset jack, and support for two call appearances, call transfer, conferencing, and secure remote provisioning. It is designed for home offices and business environments and complies with industry standards such as SIP, NAT traversal, and encrypted voice communication.
This manual covers the phone's hardware layout, telephony features, network and security configuration, installation steps, and administration tools. It includes detailed specifications, wiring diagrams, and guidance for provisioning, firmware upgrades, and troubleshooting.