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C# SMS API
Developers can use our C# SMS API to send SMS from C#.Net. The C# SMS API comes with full source code

PHP SMS API
The ozeki PHP SMS gateway software can be used to send SMS from PHP and to receive SMS usig PHP on your website

SMPP SMS Gateway
SMS service providers use our SMPP gateway solution, that offers a high performance SMPP server and SMPP client gateway with amazing routing capabilities
Android VoIP SIP SDK

How to create an Android Softphone

This tutorial contains 12 lessons. It is aimed at teaching you how to create a softphone for an Android Mobile Phone. The softphone created will use the Session Initiation Protococol (SIP), so it can be used in VoIP networks. During the tutorial, you will get familiar with terms such as SIP registration and you will learn how to use audio devices, such as the microphone and speaker.

test system
Test system
This tutorial shows you how to create test phone system, how to create two extensions, and how to call one extension from the other.
Test system
sip registration
SIP registration
Here you can learn how to add reference to Ozeki VoIP SIP SDK, in Visual Studio, and how to create an Android application softphone, which is able to register to a PBX, specified by the user's input.
SIP registration
media handlers
Media handlers
Related: VoIP SIP Media Handlers. If also you wish to build VoIP softphone on Windows, you might also be interested in a similar document, the VoIP SIP Media Handlers in Ozeki VoIP SDK for Windows.
Media handlers
make and accept calls
Make and accept calls
In the following example project you will see how to create a new Xamarin Android application in Visual Studio which is able to make and receive calls. For the example project you will need the Ozeki Android SDK, and Visual Studio Community installed. Let's create our first android softphone application.
Make and accept calls
controlling the calls
Controlling the calls
You can learn here how to control the call, such as putting the call on hold, taking the call off hold, transfering the call etc. This example requires the knowledge of SIP registering and the making of phone calles with the softphone.
Controlling the calls
sip instant messaging
SIP Instant Messaging
In the following lesson you will learn how to send and receive messages using the SIP Instant Messaging of the Ozeki Android SDK. So let's begin our journey, by creating the Xamarin Andorid application in Visual Studio.
SIP Instant Messaging
handling codecs
Handling codecs
In the following tutorial you will learn, how to make and receive calls with codecs encoding.
Handling codecs
multiple calls
Multiple calls
Related: VoIP SIP managing multiple calls. If also you wish to build VoIP softphone on Windows, you might also be interested in a similar document, the VoIP SIP Multiple Calls in Ozeki VoIP SDK for Windows.
Multiple calls
auto dialer
Auto dialer
Related: VoIP SIP auto dialer. If also you wish to build VoIP softphone on Windows, you might also be interested in a similar document, the VoIP SIP Auto Dialer in Ozeki VoIP SDK for Windows.
Auto dialer
predictive dialer
Predictive dialer
Related: VoIP SIP predictive dialer. If also you wish to build VoIP softphone on Windows, you might also be interested in a similar document, the VoIP SIP Predictive Dialer in Ozeki VoIP SDK for Windows.
Predictive dialer
multiline dialer
Multiline dialer
Related: VoIP SIP multi line dialer. If also you wish to build VoIP softphone on Windows, you might also be interested in a similar document, the VoIP SIP Multi line dialer in Ozeki VoIP SDK for Windows.
Multiline dialer
ring group
Ring group
Related: VoIP SIP handling ring groups. If also you wish to build VoIP softphone on Windows, you might also be interested in a similar document, the VoIP SIP Ring Groups in Ozeki VoIP SDK for Windows.
Ring group
call assistant
Call assistant
Related: VoIP SIP call assistant. If also you wish to build VoIP softphone on Windows, you might also be interested in a similar document, the VoIP SIP Call Assistant in Ozeki VoIP SDK for Windows.
Call assistant