Highlights

• Full featured one-line business class IP Phone
• Connect directly to an Internet Telephone Service Provider or connect to an IP PBX
• Speakerphone. Caller ID. Call Hold, Transfer, Conferencing, and more
• Easy installation with secure remote provisioning. Menu based and web based configuration.

Stylish and functional in design, the SPA921 VoIP Phone is ideal for a residence or business using a hosted IP telephony service, an IP PBX, or a large scale IP Centrex deployment. The SPA921 leverages industry leading VoIP technology from Linksys to deliver an upgradeable high quality IP Phone that is unparalleled in features, value, and support.

Standard features on the SPA921 include a high resolution graphical display, speakerphone, and a 2.5 mm head-set port. The SPA921 supports one line with two call appearances and provides support for three way conferencing, attended call transfer, and placing a call on hold to answer an incoming call. The line can be configured as a unique phone number (or extension), or can be configured to share a number that is assigned to multiple phones.

Comprehensive Interoperability and SIP Based Feature Set
Based on the SIP standard, the SPA921 has been tested to ensure comprehensive interoperability with equipment from VoIP infrastructure leaders enabling service providers to quickly roll-out competitive, feature rich services to their customers. With hundreds of features and configurable sevice parameters, the SPA921 addresses the requirements of traditional business users while leveraging the advantages of IP telephony. Features such as easy station moves, presence, and shared line appearances (across local and geographically dispersed locations) are just some of the many advantages of the SPA921.

Carrier-Grade Security, Provisioning, and Management
The SPA921 uses standard encryption protocols to provide secure remote provisioning and unobtrusive in-service software upgrades. Linksys secure remote provisioning tools include detailed performance measurement and troubleshooting features, enabling network providers to deliver high quality support to their subscribers. Remote provisioning also saves service providers the hassle and expense of managing, pre-loading, and re-configuring customer premise equipment (CPE).

Telephony Features

• One voice line with two call appearances
• Pixel-based display: 128 x 64 monochrome graphical liquid crystal display (LCD)
• Line status: active line indication, name and number
• Menu-driven user interface
• Shared line appearance (requires support by call server)
• Speakerphone
• Call hold
• Music on hold (requires support by call server)
• Call waiting
• Caller ID name and number
• Outbound caller ID blocking
• Call transfer: attended and blind
• Three-way call conferencing with local mixing
• Multiparty conferencing via external conference bridge (requires support by call server)
• Automatic redial of last calling and last called numbers
• On-hook dialing
• Call pickup: selective and group (requires support by call server)
• Call park and unpark (requires support by call server)
• Call swap
• Call back on busy
• Call blocking: anonymous and selective
• Call forwarding: unconditional, no answer, on busy
• Hot line and warm line automatic calling
• Call logs (60 entries each): made, answered, and missed calls
• Redial from call logs
• Personal directory with auto-dial (100 entries)
• Do not disturb (callers hear line busy tone)
• Digits dialed with number auto-completion
• Uniform Resource Identifier (URI) (IP) dialing support (vanity numbers)
• On-hook default audio configuration (speakerphone and headset)
• Multiple ring tones with selectable ring tone per line
• Called number with directory name matching
• Ability to call number using name: directory matching or via caller ID
• Subsequent incoming calls with calling name and number
• Date and time with intelligent daylight savings support
• Call duration and start time stored in call logs
• Call timer
• Name and identity (text) displayed at startup
• Distinctive ringing based on calling and called number
• 10 user-downloadable ring tones
• Speed dialing, eight entries
• Configurable dial/numbering plan support
• Intercom (requires support by call server)
• Group paging (requires support by call server)
• Network Address Translation (NAT) Traversal, including STUN support
• DNS SRV and multiple A records for proxy lookup and proxy redundancy
• Syslog, debug, report generation, and event logging
• Secure call encrypted voice communication support
• Built-in web server for administration and configuration with multiple security levels
• Automated remote provisioning, multiple methods; up to 256-bit encryption: (HTTP, HTTPS, Trivial File Transfer Protocol [TFTP])
• Option to require administrator password to reset unit to factory defaults

Hardware Features

• Pixel-based display: 128 x 64 monochrome LCD graphical display
• Dedicated illuminated buttons for:
  • Audio mute on/off
  • Headset on/off
  • Speakerphone on/off
• Four soft-key buttons
• Four-way rocking directional knob for menu navigation
• Voicemail message waiting indicator light
• Voicemail message retrieval button
• Dedicated hold button
• Settings button for access to feature, setup, and configuration menus
• Volume control rocking up/down knob controls handset, headset, speaker, ringer
• Standard 12-button dialing pad
• High-quality handset and cradle
• Built-in high-quality microphone and speaker
• Headset jack: 2.5 mm
• Ethernet LAN: 10BASE-T RJ-45
• 5 VDC universal (100-240V) switching power adapter
• LED test function

Regulatory Compliance

• FCC (Part 15, Class B) , CE Mark, A-Tick

Security Features

• Password-protected system, preset to factory default
• Password-protected access to administrator and user-level features
• HTTPS with factory-installed client certificate
• HTTP digest: encrypted authentication via MD5 (RFC 1321)
• Up to 256-bit Advanced Encryption Standard (AES) encryption