Session Initiation Protocol | Linksys SPA 900 SERIES manual

Chapter 1 Introducing Linksys IP Phones

Technology Background

•Using Linksys IP Phones with a Firewall or Router, page 1-9

•Using Linksys IP Phones with a Firewall or Router, page 1-9

Session Initiation Protocol

Linksys 900 Series IP phones are implemented using open standards, such as Session Initiation Protocol (SIP), allowing interoperation with all ITSPs supporting SIP. Figure 1-2illustrates a SIP request for connection to another subscriber in the network. The requestor is called the user agent server (UAS), while the recipient is called the user agent client (UAC).

Figure 1-2 SIP Requests and Responses

SIP UA

2

4

SIP Proxy

RTP

SIP Proxy

3

SIP Proxy

1

SIP UA

In a SIP VoIP network, when the SIP proxy receives a request from a UAS for a connection and it does not know the location of the UAC, it forwards the message to another SIP proxy in the network. Once the UAC is located and the response is routed back to the UAS, a direct peer-to-peer session is established between the two UAs. The actual voice traffic is transmitted between UAs over dynamically assigned ports using the Real-time Protocol (RTP).

Using Linksys IP Phones with a Firewall or Router

When using a Linksys IP phone behind a firewall or router, make sure that the following ports are not blocked:

•SIP ports—By default, UDP port 5060 and 5061

•RTP ports—16384 to 16482

If security is not a concern in your environment, you can consider disabling SPI, if this function exists on your firewall.

		Linksys IP Phone Administrator Guide
		Linksys IP Phone Administrator Guide
	Firmware Version 5.1			1-9
	Firmware Version 5.1			1-9

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Linksys SPA 900 SERIES manual Session Initiation Protocol, Using Linksys IP Phones with a Firewall or Router

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 Preface Document Audience To do this Refer to Related DocumentationTechnical Support Product Name RJ-45 Voice Lines Additional Features/Notes Overview Linksys IP Phone Features Linksys IP Phones in a VoIP Network Introducing Linksys IP Phones Linksys IP Phone Features SPA901 Features SPA92x, SPA94x, SPA962Ensuring Voice Quality Algorithm Complexity MOS Score Feature Descriptions SIP Proxy Redundancy Supported Codecs Algorithm Description Dtmf Other FeaturesFeature Description Technology Background Session Initiation Protocol, Using Linksys IP Phones with a Firewall or Router Session Initiation Protocol Network Address Translation NAT Overview NAT Types Simple Traversal of UDP Through NAT Stun SIP-NAT Interoperation Getting Started Linksys 900 Series IP Phones Caring for Your Hardware SPA901 SPA92x, SPA94x, and SPA962 Hardware Features Feature FunctionFront Panel and Side of Phone Back Panel SPA921 Front Panel SPA922 SPA932 SPA941 Port/LED MeaningAUX AUX OUT SPA942 SPA941 SPA962 SPA942 SPA9000 IP PBX System Establishing Connectivity Installing the SPA900 Series IP Phone Bandwidth Requirements1Codec Each side of conversation Calls Approximate bandwidth budget for Mounting the Phone to the Wall Assembling the Phone and Connecting to the NetworkAttaching the Desk Stand Turning on the Phone Using the Administration Web ServerConnecting to the Administration Web Server Administrator Account Privileges Click Admin and Advanced Resync URL Upgrade URLWeb Interface URLs Reboot URL Configuration ProfileProvisioning Provisioning Capabilities Using the Interactive Voice Response Interface Using the IVR Menu on a Linksys SPA901 Phone IVR Options IVR Action IVR Menu Choice Parameters Getting Started Entering a Password through the IVR NON-DEFAULTSettings will be Lost ALL NON-DEFAULT Linksys IP Phone Administrator Guide Using the 900 Series LCD Display SPA900 Series LCD Display Controls SPA900 Series LCD Controls Using Soft Keys Label SPA962 Label Description Entering and Saving Settings Input Mode Soft Key Cursor appending Cursor inserting Localization Following is an example value Changing the Display Background SPA942/962 Using the SPA932 Sidecar with the SPA962 Background Picture Parameters Configuring the SPA9000 for the SPA932 Configuring the Broadsoft Server for the SPA932 Configuring the Asterisk Server for the SPA932 Example 3-1 Asterisk Context for SPA932 Configuring the SPA932 Example 3-2 Asterisk Subscribecontext for SPA932 SPA932 Configuration Broadsoft syntax Asterisk syntax Configuring the Web Service Configuration ParametersMonitoring 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 Line Key LEDs LED Script Example LED PatternLED Script Examples Using Call Features Selecting the Audio I/O Device and Line Making Calls Answering and Ending Calls Hold and Resume Call WaitingSpeed Dialing Three-Way Conferencing Attended Call Transfer Blind Call Transfer Accessing Voicemail Call BackMessage Waiting Indication MWI Muting Calls Caller and Called Name Matching Shared Call AppearancesPersonal Directory Call Logs Supplementary ServicesDialing Assistance Audio Volume Adjustment Operation Steps Managing Ring Tones 8illustrates the user interface provided by this utility Configuring a Dial Plan Dial Plan Digit Sequences Dial Plan Rules Digit Sequence SyntaxElement Repetition Sub-sequence Substitution Dial Plan Examples Dial Plan Timers Interdigit Long TimerDefault ParName System Administration Reboot and RestartInterdigit Short Timer Dial Plans Factory Reset Password ProtectionManaging the Time/Date Daylight Saving Time Using Star Codes to Activate/Deactivate Services Managing Linksys IP Phones System Administration Disabling Services Troubleshooting FAQ Error and Log Reporting There may be a problem if the screen displays Not Registered Firmware Version SPA900 Series LCD Command Reference Entering Names and Numbers into the Directory Entering Directory Names, Numbers and Ring DefaultDirectory Call History Shortcut SetupSpeed Dial Ring Tone PreferencesRedial List Answered Calls Do Not Disturb Block Caller IDBlock Anonymous Call Secure Call Dial AssistancePreferred Audio Device Auto Answer Preferred Audio Device Cfwd No Ans Delay Call ForwardCfwd All Number Cfwd Busy Number Shortcut Setup, 7 ,date, time, offset, save Shortcut Setup, 8, voicemailnumber, saveTime/Date Voice Mail Dchp Current IP AddressHost Name Domain Enable Web Server Non Dhcp Default RouteCurrent NetMask Current Gateway Multicast Address Non Dhcp DNSNon Dhcp NTP Server Enable Vlan Product InfoVlan ID 18 CDP Status Line 1, 2,3,4 ProvisioningPhone Ext 1/2/3/4 Reboot Factory ResetCustom Reset Restart Set Password Set LCD ContrastCallPark Status Language SPA922, 942, Web Service SPA962 GUI Properties SPA962 Linksys IP Phone Field Reference Info Tab System InformationField Description Dhcp Phone Status Ext 1/2/3/4/5/6 Status Line 1/2/3/4/5/6 Call 1/2 Status REN Downloaded Ring Tone Internet Connection Type System ConfigurationSystem Tab Static IP Settings PPPoE SettingsOptional Network Configuration Field Vlan Settings Vlan ID SIP Tab SIP Parameters Field Description SIP Timer Values sec SIP T1SIP T2 SIP T4 Field Description Response Status Code Handling RTP Parameters SDP Payload Types Field Description NAT Support Parameters Linksys Key System Parameters EXT IP Provisioning Tab Regional Tab Call Progress Tones Distinctive Ring Patterns Control Timer Values sec Vertical Service Activation Codes Field Description Field Description Vertical Service Announcement Codes Outbound Call Codec Selection Codes Field Description Miscellaneous Field Description As follows Line Key 1/2/3/4/5/6 Phone TabGeneral Miscellaneous Line Key Settings Line Key LED Pattern Field Description Supplementary Services Ring Tone Auto Input Gain dB Extension Mobility Ext Tab Share Line Appearance NAT SettingsNetwork Settings SIP Settings Field Description Call Feature Settings Proxy and Registration Field Audio Configuration Subscriber Information Field Description Field Description Dial Plan Dial Plan Entry Functionality 1xxxxxxxxxx@fwdnat.pulver.com5082uid=jsmithpwd=xyz Speed Dial UserCall Forward Web Information Service Settings SPA962 Traffic Service Information Settings SPA962 Audio Volume Phone GUI Menu Color Settings SPA962 only Tab SPA962 only Call Pickup Code Unit Replace the variables in italics, as follows Unit 2 Key See the description for Unit SPA932 Status ANC B2BUABLF CAS FXS ITUHtml Http SDP SdramSIP SLA Appendix a Acronyms Linksys IP Phone Administrator Guide Glossary Appendix B Glossary