Cisco Systems ATA187I1ARF manual Components of SIP

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Chapter 1 Cisco ATA 187 Analog Telephone Adaptor Overview

Session Initiation Protocol Overview

•Determines the media capabilities of the target endpoint. Using the Session Description Protocol (SDP), SIP determines the lowest level of common services between endpoints. Conferences are established using only the media capabilities that are supported by all endpoints.

•Establishes a session between the originating and target endpoint. If the call can be completed, SIP establishes a session between the endpoints. SIP also supports mid-call changes, such as adding another endpoint to the conference or changing the media characteristic or codec.

•Handles the transfer and termination of calls. SIP supports the transfer of calls from one endpoint to another. During a call transfer, SIP establishes a session between the transferee and a new endpoint (specified by the transferring party) and terminates the session between the transferee and the transferring party. At the end of a call, SIP terminates the sessions between all parties. Conferences can consist of two or more users and can be established using multicast or multiple unicast sessions.

Components of SIP

SIP is a peer-to-peer protocol. The peers in a session are called User Agents (UAs). A user agent can function in one of these roles:

•User agent client (UAC)—A client application that initiates the SIP request.

•User agent server (UAS)—A server application that contacts the user when a SIP request is received and returns a response on behalf of the user.

Typically, a SIP endpoint is capable of functioning as both a UAC and a UAS, but functions only as one or the other per transaction. Whether the endpoint functions as a UAC or a UAS depends on the UA that initiated the request.

From an architectural standpoint, the physical components of a SIP network can also be grouped into two categories—Clients and servers. Figure 1-3illustrates the architecture of a SIP network.

Note SIP servers can interact with other application services, such as Lightweight Directory Access Protocol (LDAP) servers, a database application, or an extensible markup language (XML) application. These application services provide back-end services such as directory, authentication, and billable services.

Cisco ATA 187 Analog Telephone Adaptor Administration Guide for SIP (Version 1.0)

 

OL-21862-01

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Contents Text Part Number OL-21862-01 Americas HeadquartersPage Iii N T E N T SInstalling the ATA 187 Privacy Physical Interfaces A-2 Overview PrefaceAudience OrganizationCisco ATA 187 Analog Telephone Adapter Related DocumentationCisco Unified Communications Manager ViiiCisco Product Security Overview Document ConventionsCisco Unified Communications Manager Business Edition Convention DescriptionConvention Description Cisco Analog Telephone Adaptor Cisco ATA 187 Analog Telephone Adaptor OverviewSIP Capabilities Session Initiation Protocol OverviewComponents of SIP SIP Clients Hardware Overview Software FeaturesSecure Real-Time Transport Protocol Name Signaling Event based passthroughTransport Layer Security Protocol Fax RelayModem Standards ATA 187 SIP ServicesMethods Supported Fax ServicesSupplementary Services Installation and Configuration OverviewOL-21862-01 Preparing to Install the ATA 187 on Your Network Power Guidelines Providing Power to the ATAPower Outage Understanding Phone Configuration Files Purpose Related Topics Understanding the ATA 187 Startup ProcessRequires MAC Method Address? See Understanding Phone Configuration FilesAdding the ATA 187 with Auto-Registration Determining the MAC Address of an ATA OL-21862-01 Network Requirements Installing the ATAWhat the ATA 187 Package Includes Safety RecommendationsProcedure Installing the ATAAttaching a Phone to the ATA Verifying the ATA 187 Startup ProcessConfiguring Security on the ATA Configuring Startup Network SettingsTelephony Features Available for the ATA Configuring the ATAFeature Description Configuration Reference Unified Communications Manager Features and Services Guide, Client Administration Guide, Date/Time Group Configuration Window Path Configuring Product Specific Configuration ParametersParameter Description Adding Users to Cisco Unified Communications Manager Page OL-21862-01 Using Fax Mode Configuring Fax ServicesFax Modem Standards Fax Modem Speeds Resolving Startup Problems Troubleshooting and MaintenanceChecking Network Connectivity Verifying DNS Settings Symptom ATA 187 Unable to Obtain IP Address Verifying Dhcp Settings ATA 187 Resets UnexpectedlyVerifying Physical Connection Identifying Intermittent Network OutagesVerifying Voice Vlan Configuration Checking Static IP Address SettingsEliminating DNS or Other Connectivity Errors General Troubleshooting Tips Troubleshooting ATA 187 SecurityChecking Power Connection Problem Possible CauseTroubleshooting and Maintenance General Troubleshooting Tips Halfduxcollisionexceedthreshold Where to Go for More Troubleshooting InformationCleaning the ATA Common Supplementary Services Using SIP Supplementary ServicesCall Pickup Attended TransferCaller ID Call-Waiting Caller IDMeet-Me Conference Group Call PickupPrivacy Shared LineRedial Speed DialUnattended Transfer Voice-Messaging System Voice Mail IndicationMaking a Conference Call in the United States Call Waiting in the United States Making a Conference Call in SwedenCall Waiting in Sweden About Call ForwardingCall Forwarding in the United States Cancelling Call ForwardingCall Forwarding in Sweden Forward UnconditionalOL-21862-01 Voice Menu Codes Accessing the IVR and Configuring Your Phone SettingVlan ID Action IVR Code Navigating NotesPhysical Specifications ATA 187 SpecificationsDescription Specification Environmental Specifications Electrical SpecificationsPhysical Interfaces Software Specifications Ringing CharacteristicsSIP Compliance Reference Information Parameter Recommended Values Recommended ATA 187 Tone Parameter Values by CountryTable B-3 Italy GL-1 NumericsGL-2 GL-3 PBXGL-4 GL-5 GL-6 GL-7 GL-8 IN-1 SymbolsIN-2 DhcpIN-3 Dhcp DNSIN-4 Vlan
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