| Product Description | Linksys SPA921 - VoIP phone |
| Product Type | VoIP phone |
| VoIP Protocols | SIP v2 |
| Voice Codecs | G.711, G.723.1, G.729a |
| Intercom | Yes |
| Speakerphone | Yes |
| Caller ID | Yes |
| Automatic Redial | Yes |
| Display | LCD display - monochrome |
| Display Features | Backlit |
| Network Ports Qty | 1 x Ethernet 10Base-T |
| General |
| Product Type | VoIP phone |
| Phone Features |
| Dialer Type | Keypad |
| Dialer Location | Base |
| Conference Call Capability | 3-way |
| Intercom | Yes |
| Speakerphone | Yes |
| Caller ID | Yes |
| Automatic Redial | Yes |
| Call Waiting | Yes |
| Call Forwarding | Yes |
| Call Transfer | Yes |
| Call Hold | Yes |
| Function Buttons | Flash button, redial button |
| Volume Control | Yes |
| Ringer Control | Yes |
| Additional Functions | Call timer |
| Additional Features | On-hook dialing, music on hold, built-in web server |
| IP Telephony |
| VoIP Protocols | SIP v2 |
| Voice Codecs | G.711, G.723.1, G.729a |
| Quality of Service | IEEE 802.1Q (VLAN), Differentiated Services (DiffServ), IEEE 802.3 |
| IP Address Assignment | DHCP |
| Network Protocols | DNS |
| Network Ports Qty | 1 x Ethernet 10Base-T |
| Voice Features | Voice activity detection (VAD) |
| Network Features | Network Address Translation (NAT) |
| Phone Memory |
| Phone Directory Capacity | 100 names & numbers |
| Call Log Capacity | 60 numbers |
| Display |
| Type | LCD display - monochrome |
| Display Resolution | 128 x 64 pixels |
| Features | Backlit |
| Miscellaneous |
| Connections | 1 x headset jack / sub-mini-phone 2.5 mm |
| Cables Included | Network cable
Handset cord |
| Compliant Standards | CE, FCC Part 15 |
| Power |
| Type | Power adapter - external |
| Dimensions & Weight (Base) |
| Width | 7.7 in |
| Depth | 7.1 in |
| Height | 6.3 in |
| Weight | 2.2 lbs |
