<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09" xml:lang="en"><title>SIP

High Level API</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The SIP High Level API encapsulates the SIP call flows inside the <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> and <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> APIs. The following SIP functionality is supported using <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> and <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> APIs: </p>

<ul>

<li id="GUID-0A13EB92-CD3F-5F33-AE9F-3333BDFB5B03"><p>REGISTER - An application

that wants to start a SIP session must register to the SIP server. For more

information, see <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-02CBB3C7-9B7C-5B49-8F29-56F235FF320E">Registration</xref>. </p> </li>

<li id="GUID-63D5BA93-28C1-5CE6-A1AD-78AD21EF5C6F"><p>INVITE - An invite session

is created for activities such as setting up a voice call, and a game session.

For more information, see <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-EE044B0B-4664-57DA-BAE1-F9A3B99C453C">Session

initiation</xref>. </p> </li>

<li id="GUID-40206112-EC3B-57EF-B316-F7C938EB2118"><p>SUBSCRIBE - SIP supports

subscription to events for example, message waiting, notifying the subscriber

about the current state of the event and any changes to its state. For more

information, see <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-BF804D44-35A2-5997-9706-B48C2C30F2BE">Initiating

a session using SUBSCRIBE</xref>. </p> </li>

</ul>

<p>The <codeph>INVITE</codeph> and <codeph>SUBSCRIBE</codeph> methods must

be registered. <xref href="GUID-A412D2E5-C4BE-33F7-A610-ECBD1BD6BBF9.dita"><apiname>CSubConSIPInviteParamSet</apiname></xref> and <xref href="GUID-8ABE119B-CF5D-3FED-A26F-E889AE6B7663.dita"><apiname>CSubConSIPSubscribeParamSet</apiname></xref> classes

provide the parameters. </p>

<p> <b>Note</b>: SIP High Level API is included in the Symbian OS v9.2 onwards. </p>

<section id="GUID-02CBB3C7-9B7C-5B49-8F29-56F235FF320E"><title>Registration</title> <p>An

endpoint, for example a SIP enabled phone, that wants to start a SIP session

must use <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> to register with the SIP registrar.

For more information about RConnection, see<xref href="GUID-BD8446C5-3ADE-59A6-A13A-A5482D6FC56F.dita">Connection

Management</xref> . <xref href="GUID-506C0ECB-9424-3579-877E-1435F76B2594.dita"><apiname>ESOCK</apiname></xref> provides an interface for the

user to access the SIP high level API. <xref href="GUID-506C0ECB-9424-3579-877E-1435F76B2594.dita"><apiname>ESOCK</apiname></xref> interacts

with the SIP high level API through the <codeph>Connection</codeph> and <codeph>SubConnection</codeph> providers.

Connection and SubConnection providers are <codeph>ESOCK</codeph> server side

components that are loaded and called when <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> and <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> APIs

are used. </p> <p>The following figure shows the architectural layer where

the application interacts with SIP connection providers using SIPPARAMS. The

second layer comprising <xref href="GUID-D4F08503-F1EF-3531-9C3C-4AF24A6255F0.dita"><apiname>RSocket</apiname></xref>, <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref>,

and <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> constitute the SIPPARAMS. </p> <fig id="GUID-57FDC30F-E5AD-5C9D-8D80-71B35CB905D4">

<title>              Interface of Connection and Sub Connection.         

  </title>

<image href="GUID-FFE6BAF8-C093-53FC-8672-365BAF38E048_d0e338240_href.png" placement="inline"/>

</fig> <p>The SIP high level API models the SIP with Connection and SubConnection

providers and makes it stackable against the unified comms-infras architecture.

This enables the future connection convergence. </p> <p><b> Initial setup</b> </p> <p>A

profile data store is required to get registered with the SIP Registrar. A

SIP registration profile is a data store containing the information required

for registration such as AOR which is the IP address of registrar. The data

profile must contain the following fields: </p> <ul>

<li id="GUID-9419A4E2-40DB-52E4-9B70-89DEF5594CF6"><p>data profile type: Internet,

IMS, others </p> </li>

<li id="GUID-36207215-4ECE-5D08-AEFB-6D801DBA0902"><p>profile name IETF, IMS,

others </p> </li>

<li id="GUID-FF904FF9-9D4B-5B34-986F-8F565BDE8E41"><p>IAP name </p> </li>

<li id="GUID-C66C0664-B9A8-59C8-8C44-88634D7D2E94"><p>profile AOR list (IP

address) </p> </li>

<li id="GUID-D85CF1F0-98CA-5947-90EB-0C4D0B96EBCC"><p>autoregistration </p> </li>

<li id="GUID-FC499704-39DC-55E1-80EC-3A3F8F0A8C53"><p>private ID </p> </li>

<li id="GUID-ED9C3D8E-A8CC-5D65-B381-81EC51264980"><p>security negotiation </p> </li>

<li id="GUID-B400C58A-E180-54B7-A536-7B7103CD4274"><p>sigcomp </p> </li>

<li id="GUID-AB1D459F-CCEA-5D20-8FCE-02939F716093"><p>server (IP address of

registrar, outbound proxy) </p> </li>

<li id="GUID-999CAACE-4E8F-5EDA-877E-2A46580D9BA9"><p>server param (username,

realm, pwd) </p> </li>

<li id="GUID-B4AAE1EE-1A67-5FBE-8F75-9BCB01E2ECE2"><p>default </p> </li>

</ul> <p>Manual registration by specifying parameters is not possible. If

connection details are not available, the connection is set up using the default <filepath>profile.flag</filepath> file. </p> <p id="GUID-D17BC438-09C2-58E9-ABE8-F18B8A285B4D"><b>Creating an RConnection</b> </p> <p>Create

an <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> to register to the SIP Registrar using the

following steps. <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> must be opened on an existing

socket server session, <xref href="GUID-EF29C1D7-B1E5-370F-AE37-66231A6BE449.dita"><apiname>RSocketServ</apiname></xref>. </p> <codeblock id="GUID-AC8B369E-1DC8-5868-95E2-B09FCFE4987E" xml:space="preserve">RSocketServ    socketServer;        // Create a client interface object to the socket server

RConnection    con;                        // Create an RConnection object

TRequestStatus status = KErrNone;                // object to hold the request completion status

// Establish the connection to the Socket server

User::LeaveIfError(socketServer.Connect());        // Returns KErrorNone if the connection is successful

CleanupClosePushL(socketServer);

TUint KAFSip = 0x10000;             //SIP protocol family id

TInt err = con.Open (socketServer,KAFSip);            //open the connection

TInt err1 = con.Start();                    // Start Rconnection to initiate the registration

</codeblock> <p>When registration to the SIP registrar is successful, <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> is

used to establish the SIP Invite or SIP Subscribe session. The <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> and <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> that

is established and opened are used for either inviting a call session or subscribing

for the message status. </p> </section>

<section id="GUID-565742FA-20AB-57A8-AB81-19664F9B2BC8"><title>Session initiation</title> <p><b>SIP

Params</b> </p> <p>SIPPARAMS is used to simplify the interaction with the

SIP stack by abstracting the SIP functionality using the <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> and <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> APIs.  It

supports the basic SIP functionality. The complete SIP functionality is made

available through the SIP stack APIs. </p> <p id="GUID-EE044B0B-4664-57DA-BAE1-F9A3B99C453C"><b>Initiating

a session using INVITE</b> </p> <p> <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> is used

to establish a SIP Invite session. A SIP invitation starts when an endpoint

such as a VoIP Softphone or VoIP Hardware tries to establish a session with

a remote compliant endpoint. A successful SIP invitation consists of an INVITE-OK-ACK

triplet message exchange. The calling endpoint tries to start a session with

SIP INVITE. This is followed by OK from the called endpoint, and by ACK from

the calling endpoint that finally establishes the SIP session. </p> <p>A SIP

session can be terminated by using BYE-200OK message exchange. Either the

calling or the called party can initiate the termination. </p> <p> <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> establishes

the SIP session using the three way communication of INVITE-OK-ACK and terminates

the call using BYE-200OK. </p> <p> <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> when

used on behalf of the calling endpoint, handles the message exchange independently

and provides the status whether the session is established, denied or not

reachable. The calling endpoint must fill the necessary SIP session parameters

that are used to determine the target. </p> <p> <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> when

used on behalf of the called endpoint alerts the user of an incoming call

such as a SIP invitation. The incoming call can be either accepted or rejected

using <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref>. The application is notified about

the outcome. The information about the calling endpoint is provided in a set

of specific parameters. </p> <p>The SIP parameters for an outgoing call is

set using <xref href="GUID-A412D2E5-C4BE-33F7-A610-ECBD1BD6BBF9.dita"><apiname>CSubConSIPInviteParamSet</apiname></xref> class. The following

code shows how to initiate a call. It is assumed that you have already registered

with the SIP registrar by creating an <codeph>RConnection</codeph> object

and called <codeph>Open()</codeph>. For more information, see <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-D17BC438-09C2-58E9-ABE8-F18B8A285B4D">Creating an RConnection</xref>. </p> <codeblock id="GUID-0DCB4778-33E7-5604-A7C4-ED534B48FA33" xml:space="preserve">RSubConnection    subCon;    // Create an RSubConnection object

err=subCon.Open(socketServer,RSubConnection::ECreateNew,con); // Open subconnection onto the Rconnection

</codeblock> <p>Set the SIP Invite parameters. The following code shows how

to set the SIP Invite parameters. </p> <codeblock id="GUID-904E8A67-646D-5589-9144-60D4C2598A62" xml:space="preserve">RSubConParameterBundle     sipBundle;            // create parameter bundle

// create SIP parameter set family

CSubConParameterFamily * family = CSubConParameterFamily::NewL(sipBundle,KSubConnCallDescrParamsFamily);

// create invite parameter set object

CSubConSIPInviteParamSet* sip = CSubConSIPInviteParamSet::NewL(*family,CSubConParameterFamily::ERequested);</codeblock> <p>Set

the SIP header values to the parameter set. The following code shows how to

set the SIP header values to the parameter set. </p> <codeblock id="GUID-E298FDDC-28CE-506D-A301-B5F04DC7D7AD" xml:space="preserve">_LIT8(KTo,"Sip:user@10.112.165.91");        //'To' header, SIP URI of called endpoint

TPtrC8 ptrTo(KTo());

sip->SetToL(ptrTo);         //Set'To', the target SIP URI to the SIP parameter set

_LIT8(KFrom, "Sip:user@10.112.165.62");        //'From' header, SIP URI of the calling endPoint

TPtrC8 ptrFrom(KFrom());

sip->SetFromL(ptrFrom);                //Set the 'From' header field to the SIP parameter set

_LIT8(KContact,"Sip:user@10.112.165.62");            //'Contact' header, the actual location of the calling endpoint

TPtrC8 ptrContact (KContact());

sip->SetContactL(ptrContact);                //Set the 'Contact' to the SIP parameter set 

_LIT8(KRequestUri, "Sip:user@10.112.165.91");    //Request URI, the actual Next hop or the Target

TPtrC8 ptrRequestUri(KRequestUri());

sip-&gt;SetRequestUriL(ptrRequestUri);             //Set the 'RequestUri' to the SIP parameter set</codeblock> <codeblock id="GUID-916B4C73-B97B-5EC0-A70E-EFDD0FB51210" xml:space="preserve">TInt err = SubCon.SetParameters(sipBundle);         //Set The SIP parameters in the SubConnection

sipBundle.Close();                    //close the parameter bundle</codeblock> <p id="GUID-8676EB5B-FA5D-51EC-9FAD-C36BB29A6392"><b>Establishing the INVITE

session</b> </p> <p>To establish the SIP Invite session, use <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> to

start the subconnection. This initiates the Invite request. </p> <codeblock id="GUID-4A8E0FB2-7096-583F-9DF6-D0B2255F618A" xml:space="preserve">//Start the subconnection, effectively sending an Invite

TInt subConRet = subCon.Start(); 

// Session is established</codeblock> <p id="GUID-BF804D44-35A2-5997-9706-B48C2C30F2BE"><b>Initiating

a session using SUBSCRIBE</b> </p> <p>An endpoint subscribes to a specific

service using a SIP SUBSCRIBE-200OK message exchange. The end point is notified

by means of a NOTIFY-200OK message exchange. To send the subscription and

receive notifications use <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref>. <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> is

also used to unsubscribe, which stops any further notifications. </p> <p>The

following code shows how you subscribe to a session and receive notifications.

It assumes that you have already registered with the SIP registrar by creating

an <codeph>RConnection</codeph> object and calling <codeph>Open()</codeph> on

it as explained in <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-D17BC438-09C2-58E9-ABE8-F18B8A285B4D">Creating

an RConnection</xref> section. </p> <codeblock id="GUID-B68FF753-0D48-54C2-8DE1-282658CE96BA" xml:space="preserve">RSubConnection    subCon;// Create an RSubConnection object

// Open subconnection onto the Rconnection

err=subCon.Open(socketServer,RSubConnection::ECreateNew,con);

</codeblock> <p>Set the SIP Subscribe parameters using <xref href="GUID-8ABE119B-CF5D-3FED-A26F-E889AE6B7663.dita"><apiname>CSubConSIPSubscribeParamSet</apiname></xref>.

This class provides the SIP subscribe parameters that are passed through the

subconnection to the SIP stack. </p> <codeblock id="GUID-3512DB0A-EE9E-5B59-92D5-46F65CB9F4B4" xml:space="preserve">RSubConParameterBundle     sipBundle;                 //    create parameter bundle

//create SIP parameter set family

CSubConParameterFamily * family = CSubConParameterFamily::NewL(sipBundle,KSubConnCallDescrParamsFamily);

// create subscribe parameter set object

CSubConSIPSubscribeParamSet* sip = CSubConSIPSubscribeParamSet::NewL(*family,CSubConParameterFamily::ERequested);</codeblock> <p>Set <codeph>the

required information that is, to</codeph>, <codeph>from</codeph>, <codeph>contact,</codeph> and <codeph>reqURI</codeph> header

values to the SIP subscribe parameter set as explained in <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-EE044B0B-4664-57DA-BAE1-F9A3B99C453C">Initiating a session using INVITE</xref> section. </p> <codeblock id="GUID-11671200-F24E-5278-9408-EE75399B25C2" xml:space="preserve">// Set the required information

_LIT8(KEventType, "messagewaiting");    // subscription event type

TPtrC8 ptrEventType (KEventType());

sip->SetEventTypeL(ptrEventType);     //Set the subscription event type to 'messagewaiting'

_LIT8(KAcceptType,  "application");    //accept type

TPtrC8 ptrAcceptType(KAcceptType());

sip->SetAcceptTypeL(ptrAcceptType); //set the accept type field to 'application'

_LIT8(KAcceptSubType,   "indication"); //accept subtype

TPtrC8 ptrAcceptSubType(KAcceptSubType());

sip->SetAcceptSubTypeL(ptrAcceptSubType);    //set the accept subtype

sip->SetExpires(3600);    // set the subscription Refresh timings

sip->SetAutoRefresh(ETrue); // set Auto Refresh to 'on' 

// pass SIP subscribe parameters through the subconnection

Tint err = subCon.SetParameters(sipBundle);

sipBundle.Close(); //close the parameter bundle

subCon.Start();    // Start the subscription

</codeblock> <p>To receive notifications to the subscribed events, <xref href="GUID-106A74C7-9B70-3397-973C-E317C1F40C58.dita"><apiname>CSubConSIPNotificationEvent</apiname></xref> class

is used. </p> <codeblock id="GUID-4D3A9189-1AA5-5275-A5B6-425085006A25" xml:space="preserve">// Wait and receive notifications to events

while(ETrue)

{

TNotificationEventBuf evtBuf;         // Sub-connection event notification object

    TRequestStatus reqStatus;             // request status object

    User::WaitForRequest(reqStatus);

    TInt eventId = evtBuf.Id();                     // get sub-type id

    TInt groupId = evtBuf.GroupId();         // get group id of the event

if (eventId == KSubConSIPNotificationEventType && groupId == KSubConSIPEventsUid)

        {

                CSubConSIPNotificationEvent * evtRes = (CSubConSIPNotificationEvent*)CSubConNotificationEvent::NewL(evtBuf);

                CleanupStack::PushL(evtRes);    

                ....................

                ....................

                CleanupStack::PopAndDestroy(evtRes);    

            // Since We do not want to receive more notifications in this stage, break from the loop.

                break;

        }

// we can wait again for another notification

subCon.EventNotification( evtBuf,EFalse, reqStatus);  //request for notification

}</codeblock> <p>Unsubscribe to events and unregister, refer to steps in the <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-FB267A38-FFB3-5360-9DC8-3E42C5C546A4">Terminating

the session</xref> section. </p> <p><b>Setting authentication parameters</b> </p> <p>A

remote party or a server may require authentication before it allows an endpoint

to establish a session with another endpoint. <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> provides

an authentication mechanism where the authentication information such as realm,

username and password must be provided while initiating the call. If a challenge

is received then <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> provides the realm and

initiates a new session with authentication parameters. </p> <p>Authentication

parameters are set in a subconnection parameter bundle as shown in the following

code fragment. Set the SIP authenticate parameter set using <xref href="GUID-155DBCFD-76A4-3852-855E-0E0E8F1EC775.dita"><apiname>CSubConSIPAuthenticateParamSet</apiname></xref>.

This class provides the SIP authenticate parameter values that are passed

through the subconnection to the SIP stack. </p> <codeblock id="GUID-BE7DB575-79EE-5D13-B3CB-041579DD5D57" xml:space="preserve">RSubConParameterBundle     sipBundle;                         //    create parameter bundle

// Add authorisation parameters as new family

CSubConParameterFamily * family1 = CSubConParameterFamily::NewL(sipBundle,KSubConAuthorisationFamily );

// create authenticate parameter set object

CSubConSIPAuthenticateParamSet * authParam = CSubConSIPAuthenticateParamSet::NewL(*family1,CSubConParameterFamily::ERequested);

</codeblock> <p>Set <codeph>the required information that is, to</codeph>, <codeph>from</codeph>, <codeph>contact</codeph>, <codeph>reqURI</codeph> header field values to the SIP authenticate parameter set, similar to that

in <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-EE044B0B-4664-57DA-BAE1-F9A3B99C453C">Initiating

a session using INVITE</xref> section. </p> <codeblock id="GUID-55C1E9B8-B6CB-565D-9163-31421965C01A" xml:space="preserve">_LIT8(KRealm, "SFTF");

_LIT8(KUserName, "MyUserName");

_LIT8(KPwd, "pass123");

authParam->SetRealmL(KRealm);    //set the Realm parameter

authParam->SetUserNameL(KUserName);    // set the username

authParam->SetPasswordL(KPwd);                    //set the password

TInt err = subCon.SetParameters(sipBundle); //set the Authenticate parameters to the subconnection

sipBundle.Close();                    //close the parameter bundle</codeblock> <p>To

terminate the call session or unsubscribe to events and unregister, follow

the steps in <xref href="GUID-4120651F-E0B9-5927-96B9-2662C51F5A09.dita#GUID-4120651F-E0B9-5927-96B9-2662C51F5A09/GUID-FB267A38-FFB3-5360-9DC8-3E42C5C546A4">Terminating

the session</xref> section. </p> </section>

<section id="GUID-FB267A38-FFB3-5360-9DC8-3E42C5C546A4"><title>Terminating

the session</title> <p>To terminate the SIP INVITE or SUBSCRIBE session: </p> <ul>

<li id="GUID-E1DABB93-F761-554F-82F9-78CAF0116A2C"><p>send BYE message by

closing the <xref href="GUID-0AFDA357-EE44-3788-9CAB-162B874134BF.dita"><apiname>RSubConnection</apiname></xref> session </p> </li>

<li id="GUID-D8757702-DB58-5F75-A00A-9251B3975CFF"><p>unregister with the

SIP registrar by closing the <xref href="GUID-BED8A733-2ED7-31AD-A911-C1F4707C67FD.dita"><apiname>RConnection</apiname></xref> session. </p> </li>

</ul> <codeblock id="GUID-F5281FE3-651C-5DAD-9569-5A7C967233F0" xml:space="preserve">Int ret = subCon.Stop();    // Terminate the session, send BYE message

subCon.Close();        // close the subconnection

con.Stop();      // Terminate the connection

con.Close();        // Close the connection </codeblock> </section>

<section id="GUID-B6F7F947-1E4B-4DFD-80B4-70E5E890685A"><title>See also</title> <p> <xref href="GUID-FA4F1E9F-8775-51E4-99DD-D334E73319C5.dita">Socket Server Protocols Overview</xref>  </p> <p> <xref href="GUID-6BB74A83-C6EA-5BC2-B60F-8186CC896725.dita">Sockets Client Overview</xref>  </p> <p><xref href="GUID-BD8446C5-3ADE-59A6-A13A-A5482D6FC56F.dita">Connection Management</xref></p> </section>