Subscribe - Advanced method

The Subscribe method is used to establish a subscription for the purpose of receiving notifications (via the NOTIFY method) about a particular event. In the example below see how Bob subscribes for "presence" event.

C# example

using System;
using Independentsoft.Sip;
using Independentsoft.Sip.Methods;

namespace Sample 
{
    class Program
    {
        private static SipClient client;

        public static void Main(string[] args)
        {
            client = new SipClient("sipdomain.com", "Bob", "password");

            Logger logger = new Logger();
            logger.WriteLog += new WriteLogEventHandler(OnWriteLog);
            client.Logger = logger;

            client.ReceiveRequest += new ReceiveRequestEventHandler(OnReceiveRequest);
            client.ReceiveResponse += new ReceiveResponseEventHandler(OnReceiveResponse);

            client.Connect();
            client.Register("sip:mydomain.com", "sip:Bob@mydomain.com", "sip:Bob@" + client.LocalIPEndPoint);

            Subscribe subscribe = new Subscribe();
            subscribe.Uri = "sip:Alice@mydomain.com";
            subscribe.From = new ContactInfo("Bob", "sip:Bob@mydomain.com");
            subscribe.To = new ContactInfo("Alice", "sip:Alice@mydomain.com");
            subscribe.Contact = new Contact("Bob", "sip:Bob@" + client.LocalIPEndPoint);
            subscribe.Event = "presence";
            subscribe.Expires = 3600;
            subscribe.AllowEvents = "dialog, presence";

            client.SendRequest(subscribe);

            Console.WriteLine("Press ENTER to exit.");
            Console.Read();
            client.Disconnect();
        }

        private static void OnReceiveRequest(object sender, RequestEventArgs e)
        {
            Response response = client.AcceptRequest(e.Request);
        }

        private static void OnReceiveResponse(object sender, ResponseEventArgs e)
        {
        }

        private static void OnWriteLog(object sender, WriteLogEventArgs e)
        {
            Console.Write(e.Log);
        }
    }
}

VB example

Imports System
Imports Independentsoft.Sip
Imports Independentsoft.Sip.Methods

Module Module1
    Private client As SipClient

    Public Sub Main(ByVal args() As String)

        client = New SipClient("sipdomain.com", "Bob", "password")

        Dim logger As Logger = New Logger
        AddHandler logger.WriteLog, AddressOf OnWriteLog
        client.Logger = logger

        AddHandler client.ReceiveRequest, AddressOf OnReceiveRequest
        AddHandler client.ReceiveResponse, AddressOf OnReceiveResponse


        client.Connect()
        client.Register("sip:sipdomain.com", "sip:Bob@mydomain.com", "sip:Bob@" + client.LocalIPEndPoint.ToString())

        Dim subscribe As Subscribe = New Subscribe
        subscribe.Uri = "sip:Alice@mydomain.com"
        subscribe.From = New ContactInfo("Bob", "sip:Bob@mydomain.com")
        subscribe.To = New ContactInfo("Alice", "sip:Alice@mydomain.com")
        subscribe.Contact = New Contact("Bob", "sip:Bob@" + client.LocalIPEndPoint.ToString())
        subscribe.Event = "presence"
        subscribe.Expires = 3600
        subscribe.AllowEvents = "dialog, presence"

        client.SendRequest(subscribe)

        Console.WriteLine("Press ENTER to exit.")
        Console.Read()
        client.Disconnect()

    End Sub

    Private Sub OnReceiveRequest(ByVal sender As Object, ByVal e As RequestEventArgs)
        Dim response As Response = client.AcceptRequest(e.Request)
    End Sub

    Private Sub OnReceiveResponse(ByVal sender As Object, ByVal e As ResponseEventArgs)
    End Sub

    Private Sub OnWriteLog(ByVal sender As Object, ByVal e As WriteLogEventArgs)
        Console.Write(e.Log)
    End Sub

End Module

Independentsoft

SIP .NET > Tutorial > Subscribe - Advanced method

Need help? Ask our developers: