Cisco Small Business IP Phones

Features of the SPA901

Document ID: 109221

Updated: Dec 12, 2008



This article is one in a series to assist in the setup, troubleshooting, and maintenance of Cisco Small Business products (formerly Linksys Business Series).

Q. What are the features of the SPA-901?


Comprehensive Interoperability and SIP Based Feature Set

Based on the SIP standard, the SPA901 has been tested to ensure comprehensive interoperability with equipment from VoIP infrastructure leaders enabling service providers to quickly rollout competitive, feature rich services to their customers. With hundreds of features and configurable service parameters, the SPA901 addresses the requirements of traditional business users while leveraging the advantages of IP telephony. Features such as easy station moves and shared line appearances (across local and geographically dispersed locations) are just some of the many advantages of the SPA901.

Carrier-Grade Security, Provisioning, and Management

The SPA901 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).

Telephone Features:

  • One Service Provider Line
  • Two Call Appearances Accessed Via Flash Key or Hook-Flash
  • Shared Line Appearance **
  • Line Status Indicator
  • Call Hold
  • Music on Hold **
  • Call Waiting
  • Outbound Caller ID Blocking
  • Call Transfer - Attended and Blind
  • Three Way Conferencing with Local Mixing
  • Multi-Party Call Conferencing via External Conference Bridge **
  • Call Pick Up - Selective and Group **
  • Call Park and UnPark **
  • Call Back on Busy
  • Call Blocking - Anonymous and Selective
  • Call Forwarding - Unconditional, No Answer, On Busy
  • Call Return - Redial Last Caller
  • Hot Line and Warm Line Automatic Calling
  • Call Logs (60 entries each): Made, Answered, and Missed Calls. Accessed via HTTP Server.
  • Redial Last Called Number
  • Do Not Disturb (callers hear line busy tone)
  • lock Anonymous Incoming Calls
  • URI (IP) Dialing Support (Vanity Numbers)
  • Built-in Web Server for Administration and Configuration, with User and Admin Access Levels
  • Built-in Interactive Voice Response system to check status and change configuration
  • Date and Time with Intelligent Daylight Savings Support
  • Call Start Time Stored in Call Logs
  • Distinctive Ringing
  • Ten User Downloadable Ring Tones - Ring Tone Generator Free from
  • Speed Dial (8 entries)
  • Group Paging (outbound only) **
  • Intercom (outbound only) **
  • Set Preferred CODEC, Per Call, All Calls
  • Configurable Dial/Numbering Plan Support
  • Ringer and Handset Volume Controls
  • Handset Input Gain Adjustment
  • 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
  • NAT Traversal
  • Automated Provisioning, Multiple Methods. Up to 256 Bit Encryption: (HTTP, HTTPS, TFTP)
  • Support Linksys Voice System Automatic Configuration
  • Optionally Require Admin Password to Reset Unit to factory defaults
    ** Feature requires support by call server


  • Voice Mail Message Waiting Indicator Light
  • Redial Button
  • Dedicated Flash Button
  • Volume Control Button Cycles Through Volume Levels. Controls Ringer and Handset Volume.
  • Standard 12-Button Dialing Pad
  • High Quality Handset and Cradle
  • Ethernet LAN - 10BaseT RJ-45
  • 5 volt DC Universal (100-240 Volt) Switching Power Adaptor

Data Networking:

MAC Address (IEEE 802.3)
IPv4 - Internet Protocol v4 (RFC 791) upgradeable to v6 (RFC 1883)
ARP - Address Resolution Protocol
DNS - A Record (RFC 1706), SRV Record (RFC 2782)
DHCP Client - Dynamic Host Configuration Protocol (RFC 2131)
ICMP - Internet Control Message Protocol (RFC792)
TCP - Transmission Control Protocol (RFC793)
UDP - User Datagram Protocol (RFC768)
RTP - Real Time Protocol (RFC 1889) (RFC 1890)
RTCP - Real Time Control Protocol (RFC 1889)
DiffServ (RFC 2475), Type of Service - TOS (RFC 791/1349)
VLAN Tagging 802.1p/q - Layer 2 QoS
SNTP - Simple Network Time Protocol (RFC 2030)

Voice Gateway:

SIPv2 - Session Initiation Protocol Version 2 (RFC 3261, 3262, 3263, 3264)
SIP Proxy Redundancy - Dynamic via DNS SRV, A Records
Re-registration with Primary SIP Proxy Server
SIP Support in Network Address Translation Networks - NAT (including STUN)
SIPFrag (RFC 3420)
Secure (Encrypted) Calling via Pre-Standard Implementation of Secure RTP
Codec Name Assignment
Voice Algorithms:
- G.711 (A-law and m -law)
- G.726 (16/24/32/40 kbps)
- G.729 A
- G.723.1 (6.3 kbps, 5.3 kbps)
Dynamic Payload Support
Adjustable Audio Frames Per Packet
DTMF: In-band and Out-of-Band (RFC 2833) (SIP INFO)
Flexible Dial Plan Support with Inter-Digit Timers
IP Address / URI Dialing Support
Call Progress Tone Generation
Jitter Buffer - Adaptive
Frame Loss Concealment
VAD - Voice Activity Detection with Silence Suppression
Attenuation / Gain Adjustments
MWI - Message Waiting Indicator Tones
VMWI - Visual Message Waiting Indicator - Via NOTIFY, SUBSCRIBE
Third Party Call Control (RFC 3725)


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 AES Encryption

Provisioning, Administration, and Maintenance:

Integrated Web Server Provides Web Based Administration and Configuration
Integrated Voice Response system to report and modify configuration parameters
Automated Provisioning and Upgrade via HTTPS, HTTP, TFTP
Asynchronous Notification of Upgrade Availability via NOTIFY
Non-intrusive, In-Service Upgrades
Report Generation and Event Logging
Statistics Transmitted in BYE Message
Syslog and Debug Server Records - Configurable Per Line

Physical Interfaces:

1 10baseT RJ-45 Ethernet Port (IEEE 802.3)
Handset: RJ-7 Connector

Power Supply:

Switching Type (100-240v) Automatic
DC Input Voltage: +5 Volts DC at 2.0 Amps Maximum
Power Consumption: 5 Watts
Power Adapter: 100-240v - 50-60Hz (26-34VA) AC Input, 1.8m cord

Indicator Lights/LED:

Status LED
Message Waiting Indicator LED
Flash Button with Indicator LED
LED Test Function


Dimensions (W x H x D): 4.13 x 3.75 x 8.38 inches (104.78 x 95.25 x 212.73 mm)
Unit Weight: 1.70 lbs (0.7711 kg)
Operating Temperature: 32 to 113 F (0 to 45 C)
Storage Temperature: -13 to 185 F (-25 to 85 C)
Operating Humidity: 10 to 90% Non-condensing
Storage Humidity: 10 to 90% Non-condensing

Package Content:

  • SPA901 IP Phone and Handset
  • Handset Cord - 56 cm (26 in)
  • 5v Power Adapter - 1.8 m (6 ft) Cord
  • RJ45 Ethernet Cable - 1.8 m (6 ft) Cord
  • Quick Installation Guide

Related Information

Updated: Dec 12, 2008
Document ID: 109221