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Affordable VoIP for Small Businesses
Bring a graphic dimension to your Internet telephony with Cisco's SPA921's high-resolution display. Part of Cisco Small Business IP Phone Series, the SPA921 IP Phone includes a high-resolution display, speakerphone, and a 2.5 mm headset port.
The SPA921 supports one line with two call appearances, as well as three-way conferencing, attended call transfer, and call hold. Utilizing its Ethernet port, 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.
Additional features of the Cisco SPA921 IP Phone include:
- Easy station moves and shared line appearances across local and geographically dispersed locations
- Standard encryption protocols to provide secure remote provisioning and unobtrusive in-service software upgrades
- Detailed performance measurement and troubleshooting
Additional Documentation
Data Sheets and Literature

Q&A

(All Cisco Small Business IP Phones Q&A)

(All Cisco Small Business IP Phones Q&A)
Configuring an SPA9XX phone for voicemail service

Configuring Shared Line Extension on SPA9xx Series Phones

Determining if the Unit is Defective

Determining if the Unit is Defective

Experiencing Difficulties with the Voicemail Indicator

Explaining Dial Plan

Explaining Dial Plans

Explaining the Different Dial Plans

Getting to Know Dial Plans

Getting to Know Dial Plans Sequences

Identifying the Factors that Affect Voice Quality

Identifying the Factors that Affect Voice Quality

Initial configuration for SPA921

LCD Problem on SPA9XX Phone

Making calls from SPA921

Registering IP Phones and ATA Devices on the LAN and WAN Side

Resetting SPA2100

Resetting the IP Phone to Factory Default

Routing a call to PSTN

Running a Syslog on SPA Devices

Sample configuration of SPA921 to Online Service Provider

Set up SPA9xx behind NAT

Setting-Up Static IP Address on the IP Phone

SPA9xx Series Phone Experiencing Reboots

SPA9xx Set up behind NAT and Experiencing Voice Problem

Troubleshooting SPA Device: faq

Upgrading Firmware of SPA9xx Series Phone

Configuring Shared Line Extension on SPA9xx Series Phones
Determining if the Unit is Defective
Determining if the Unit is Defective
Experiencing Difficulties with the Voicemail Indicator
Explaining Dial Plan
Explaining Dial Plans
Explaining the Different Dial Plans
Getting to Know Dial Plans
Getting to Know Dial Plans Sequences
Identifying the Factors that Affect Voice Quality
Identifying the Factors that Affect Voice Quality
Initial configuration for SPA921
LCD Problem on SPA9XX Phone
Making calls from SPA921
Registering IP Phones and ATA Devices on the LAN and WAN Side
Resetting SPA2100
Resetting the IP Phone to Factory Default
Routing a call to PSTN
Running a Syslog on SPA Devices
Sample configuration of SPA921 to Online Service Provider
Set up SPA9xx behind NAT
Setting-Up Static IP Address on the IP Phone
SPA9xx Series Phone Experiencing Reboots
SPA9xx Set up behind NAT and Experiencing Voice Problem
Troubleshooting SPA Device: faq
Upgrading Firmware of SPA9xx Series Phone