Bandwidth Requirements1 | Linksys SPA 900 specs

Chapter 2 Getting Started

Establishing Connectivity

•Installing the SPA900 Series IP Phone, page 2-10

Bandwidth Requirements1

Depending on how you have your IP phones configured, each call requires 55 to 110 kbps in each direction. Therefore, using G.729 as the voice codec setting, and with an average business-grade broadband Internet connection supporting 1.5 Mbps downstream and 384 kbps upstream, a total of seven

(7)simultaneous conversations can be reliably supported with adequate bandwidth available for file downloads.

Linksys recommends using the Linksys IP phone with QoS-capable networking equipment that can prioritize the VoIP application traffic. QoS features are available on many Linksys data networking switches and routers. A QoS-enabled router prioritizes the packets going upstream to the ISP. Table 2-1illustrates the bandwidth budget using different codecs.

Table 2-1 Ethernet Bandwidth Budget for Off-Net VoIP Calling

	Approximate bandwidth budget for
Codec	each side of conversation	2 calls	4 calls	6 calls	8 calls

G.711	110 kbps	220 kbps	440 kbps	660 kbps	880 kbps

G.726-40	87 kbps	174 kbps	348 kbps	522 kbps	696 kbps

G.726-32	79 kbps	158 kbps	316 kbps	474 kbps	632 kbps

G.726-24	71 kbps	142 kbps	284 kbps	426 kbps	568 kbps

G.726-16	63 kbps	126 kbps	252 kbps	378 kbps	504 kbps

G.729	55 kbps	110 kbps	220 kbps	330 kbps	440 kbps

This table is based on the following assumptions:

•Bandwidth Calculated with No Silence Suppression

•20 Millisecond of payload per RTP packet

Note The use of silence suppression can reduce the average bandwidth budget by 30% or more.

For more information about bandwidth calculation, refer to the following websites:

http://www.erlang.com/calculator/lipb/

http://www.packetizer.com/voip/diagnostics/bandcalc.html

Installing the SPA900 Series IP Phone

This section describes how to install and verify operation of SPA900 Series IP phones.

Check to make sure that you have the following package contents:

•Linksys 900 Series phone

•Ethernet cable

•Power adapter (must be ordered separately for PoE units: SPA922, SPA942, and SPA962)

	Linksys IP Phone Administrator Guide
2-10	Firmware Version 5.1

Image 33

Linksys SPA 900 Bandwidth Requirements1, Installing the SPA900 Series IP Phone, Codec Each side of conversation Calls

Contents

Linksys Voice System SPA 900 Series IP Phones N T E N T S Front Panel Back Panel SPA922 SPA932 SPA941 SPA942 SPA962 Localization Directory Time/Date Voice Mail Network Phone Phone Tab General User Document Audience Preface Related Documentation Technical SupportTo do this Refer to Overview Product Name RJ-45 Voice Lines Additional Features/Notes Linksys IP Phones in a VoIP Network Linksys IP Phone Features Introducing Linksys IP Phones Linksys IP Phone Features SPA92x, SPA94x, SPA962 SPA901 FeaturesEnsuring Voice Quality Algorithm Complexity MOS Score SIP Proxy Redundancy Feature Descriptions Algorithm Description Supported Codecs Other Features Feature DescriptionDtmf Session Initiation Protocol, Technology Background Session Initiation Protocol Using Linksys IP Phones with a Firewall or Router NAT Overview Network Address Translation Simple Traversal of UDP Through NAT Stun NAT Types SIP-NAT Interoperation Linksys 900 Series IP Phones Getting Started SPA901 Caring for Your Hardware Feature Function SPA92x, SPA94x, and SPA962 Hardware FeaturesFront Panel and Side of Phone Back Panel Front Panel SPA921 SPA932 SPA922 Port/LED Meaning SPA941AUX AUX OUT SPA941 SPA942 SPA942 SPA962 Establishing Connectivity SPA9000 IP PBX System Bandwidth Requirements1 Installing the SPA900 Series IP PhoneCodec Each side of conversation Calls Approximate bandwidth budget for Assembling the Phone and Connecting to the Network Attaching the Desk StandMounting the Phone to the Wall Using the Administration Web Server Connecting to the Administration Web ServerTurning on the Phone Click Admin and Advanced Administrator Account Privileges Upgrade URL Web Interface URLsResync URL Configuration Profile Reboot URLProvisioning Provisioning Capabilities Using the IVR Menu on a Linksys SPA901 Phone Using the Interactive Voice Response Interface IVR Action IVR Menu Choice Parameters IVR Options Getting Started NON-DEFAULT Entering a Password through the IVRSettings will be Lost ALL NON-DEFAULT Linksys IP Phone Administrator Guide SPA900 Series LCD Display Controls Using the 900 Series LCD Display SPA900 Series LCD Controls Label SPA962 Label Description Using Soft Keys Input Mode Soft Key Cursor appending Cursor inserting Entering and Saving Settings Localization Following is an example value Changing the Display Background SPA942/962 Background Picture Parameters Using the SPA932 Sidecar with the SPA962 Configuring the Broadsoft Server for the SPA932 Configuring the SPA9000 for the SPA932 Example 3-1 Asterisk Context for SPA932 Configuring the Asterisk Server for the SPA932 Example 3-2 Asterisk Subscribecontext for SPA932 Configuring the SPA932 SPA932 Configuration Asterisk syntax Broadsoft syntax Configuration Parameters Configuring the Web ServiceMonitoring the SPA932 Web Interface Basic and Advanced Views Proxy1, RTPPacketSize, DNDActCode Data Types Example 1 Normal Ring Managing Linksys IP Phones Configuring the Web Service Example 3 SIT Tone RSS Newsfeeds SPA962 Call Appearances and Extensions LED Script Line Key LEDs LED Pattern LED Script ExamplesExample Selecting the Audio I/O Device and Line Using Call Features Answering and Ending Calls Making Calls Call Waiting Hold and ResumeSpeed Dialing Three-Way Conferencing Blind Call Transfer Attended Call Transfer Call Back Accessing VoicemailMessage Waiting Indication MWI Muting Calls Shared Call Appearances Personal DirectoryCaller and Called Name Matching Supplementary Services Dialing AssistanceCall Logs Operation Steps Audio Volume Adjustment 8illustrates the user interface provided by this utility Managing Ring Tones Dial Plan Digit Sequences Configuring a Dial Plan Digit Sequence Syntax Dial Plan RulesElement Repetition Sub-sequence Substitution Dial Plan Examples Interdigit Long Timer Dial Plan TimersDefault ParName Reboot and Restart System AdministrationInterdigit Short Timer Dial Plans Password Protection Factory ResetManaging the Time/Date Daylight Saving Time Using Star Codes to Activate/Deactivate Services Managing Linksys IP Phones System Administration Disabling Services Error and Log Reporting Troubleshooting FAQ There may be a problem if the screen displays Not Registered Firmware Version SPA900 Series LCD Command Reference Entering Directory Names, Numbers and Ring Default DirectoryEntering Names and Numbers into the Directory Shortcut Setup Speed DialCall History Preferences Ring ToneRedial List Answered Calls Block Caller ID Block Anonymous CallDo Not Disturb Dial Assistance Secure CallPreferred Audio Device Auto Answer Preferred Audio Device Call Forward Cfwd No Ans DelayCfwd All Number Cfwd Busy Number Shortcut Setup, 8, voicemailnumber, save Shortcut Setup, 7 ,date, time, offset, saveTime/Date Voice Mail Current IP Address DchpHost Name Domain Non Dhcp Default Route Enable Web ServerCurrent NetMask Current Gateway Non Dhcp DNS Non Dhcp NTP ServerMulticast Address Product Info Enable VlanVlan ID 18 CDP Status Provisioning Line 1, 2,3,4Phone Ext 1/2/3/4 Factory Reset RebootCustom Reset Restart Set LCD Contrast Set PasswordCallPark Status Language SPA922, 942, GUI Properties SPA962 Web Service SPA962 Linksys IP Phone Field Reference System Information Info TabField Description Dhcp Ext 1/2/3/4/5/6 Status Phone Status REN Line 1/2/3/4/5/6 Call 1/2 Status Downloaded Ring Tone System Configuration System TabInternet Connection Type PPPoE Settings Static IP SettingsOptional Network Configuration Field Vlan ID Vlan Settings SIP Parameters SIP Tab Field Description SIP T1 SIP Timer Values secSIP T2 SIP T4 Field Description RTP Parameters Response Status Code Handling SDP Payload Types Field Description NAT Support Parameters EXT IP Linksys Key System Parameters Provisioning Tab Call Progress Tones Regional Tab Distinctive Ring Patterns Control Timer Values sec Vertical Service Activation Codes Field Description Field Description Outbound Call Codec Selection Codes Vertical Service Announcement Codes Field Description Miscellaneous Field Description As follows Phone Tab GeneralLine Key 1/2/3/4/5/6 Line Key LED Pattern Miscellaneous Line Key Settings Field Description Supplementary Services Ring Tone Extension Mobility Auto Input Gain dB Ext Tab NAT Settings Network SettingsShare Line Appearance SIP Settings Field Description Call Feature Settings Proxy and Registration Field Subscriber Information Audio Configuration Field Description Field Description Dial Plan Entry Functionality Dial Plan 1xxxxxxxxxx@fwdnat.pulver.com5082uid=jsmithpwd=xyz User Call ForwardSpeed Dial Traffic Service Information Settings SPA962 Web Information Service Settings SPA962 Phone GUI Menu Color Settings SPA962 only Audio Volume Call Pickup Code Tab SPA962 only Replace the variables in italics, as follows Unit Unit 2 Key See the description for Unit SPA932 Status B2BUA ANCBLF CAS ITU FXSHtml Http Sdram SDPSIP SLA Appendix a Acronyms Linksys IP Phone Administrator Guide Glossary Appendix B Glossary