Voxeo Labs

Get Started with Moho

Wei Chen — Thu, 02 Jun 2011 04:15:35 +0000

Last post I showed you how simple a Moho application looks like. Now let me explain a bit more how that simple Moho application works.

To develop a Moho application, you have to start with a Java class that implements Application interface. This class must be a public class with a public default constructor. The two abstract methods defined in Application are to notify the application about lifecycle changes. So a simplest do-nothing Moho application looks like the following.

public class HelloWorld implements Application {
  public void init(ApplicationContext context) {
  }
  public void destroy() {
  }
}

Next let’s add some code to accept an incoming call.

public class HelloWorld implements Application {
   ...
  @State
  public void onCall(Call call) {
     call.answer();
   }
}

Now HelloWorld application can receive and answer an incoming call. The @State annotation has something to do with Moho’s state based event dispatching, which I will talk about in the future.

To make this application deployable to Voxeo PRISM, all you have to do is to pack this application into a WAR.

moho.2.war
  |--- WEB-INF
         |--- classes
                |--- HelloWorld.class

To run this application, simply copy the WAR to /apps directory. To test, simply use a softphone to dial something like sip:moho@localhost.

Introducing Moho Framework

Introducing Moho Framework

Wei Chen — Fri, 27 May 2011 21:52:47 +0000

I have blogged quite a bit about developing VoIP applications using SIP Servlet and Java Media Control APIs on top of Voxeo PRISM. Both are great standards by the Java community for call controls and media controls. But I have to admit that using these two APIs is not easy. Developers have to not only understand underlying protocols but also deal with the complexity of asynchronous event driven programing. Even worse, since SIP Servlet and Java Media Control are independent APIs, developers have to deal with different event models and uncorrelated state machines.

Given all the complexities of using SIP Servlet and Java Media Control APIs, I am quite excited about the Moho framework we are developing on top of SIP Servlet and Java Media Control APIs. It offers the best of both world. First, you have one much-easy-to-use and unified API for both call control and media control. Second, Moho framework is open source and sits on top of standard SIP Servlet and Java Media Control APIs so you don’t have to worry about vendor lock-in.

Before I get into details about Moho, let me show you a simple example to see how much work can be reduced by using Moho. Here I want to develop a simple IVR application which accepts every call and announces “Hello World” to the caller every 5 seconds.

To write this using SIP Servlet and Java Media Control, here is the HelloWorldServlet.java, which has about 200 lines of Java code.

On the other hand, a HellowWorld Moho application that provides the same functionality only has about 25 lines of Java code.

package com.voxeo.moho.tutorial.one;

import com.voxeo.moho.Application;
import com.voxeo.moho.ApplicationContext;
import com.voxeo.moho.Call;
import com.voxeo.moho.State;

public class HelloWorld implements Application {
  public void init(ApplicationContext context) {
  }

  public void destroy() {
  }

  @State
  public void onCall(Call call) {
    call.answer();
    while (call.getCallState() == Call.State.CONNECTED) {
      try {
        call.getMediaService().output("Hello World!").get();
        Thread.sleep(5000);
      }
      catch (Exception e) {
      }
    }
  }
}

Even with far less lines of code, this Moho application actually handles more functions, such as SIP reInvite, SIP Cancel, etc.

To run this HelloWorld Moho application, simply download and deploy the WAR to /apps directory, assuming you have Voxeo PRISM already installed.

You may also run this application on any other JSR 289 and JSR 309 compliant servers. Since other servers probably don’t have Moho dependencies embedded, you have to add all the Moho runtime dependencies to WAR. Moho runtime dependencies can be downloaded from Moho Downloads.

Get Started with Moho

San Francisco Telephony Meetup on December 15th

Jason Goecke — Mon, 06 Dec 2010 18:44:57 +0000

This month’s SF Telephony Meetup, headlined as ‘Telephony is Sexy’, is shaping up to have an interesting agenda:

Alex Kauffmann, NYU, on Possibilities in Telephony

Alex is a recent graduate of the ITP program at NYU. He has done several projects that involve telephony and interaction design as artistic media to surprise and delight. He will give a brief introduction to his approach followed by showing three or four innovative use of telephony in his projects.

Adam Odessky, Orange Labs, on Augmented Reality in Telephony

Adam will demo and talk about how cloud communications are a crucial component in the creation of next generation mobile enterprise mashups that boost productivity and improve collaboration among workers. We also delve into other topics such as augmented reality to better understand how the two mediums can work together in the enterprise.

Jason Goecke, Voxeo Labs, on Asterisk SCF

At the recent Astricon, Digium announced Asterisk SCF, a framework that allows developers to create real-time communications applications that include voice, video and text and that meet the demands of a full range of uses, from embedded applications to enterprise and carrier solutions. Asterisk SCF is architected to provide the highest levels of availability, scalability, extensibility, fault-tolerance and performance. Jason will give an overview and insights of what was launched at Astricon.

So mark your calendar and come join us for this month’s meetup. The event will be held at 6.30pm on Wednesday December 15, 2010 at Orange Labs in South San Francisco. See you there!

No related posts.

Want to understand Phono? Tropo? Voxeo Labs? Listen to this podcast!

Dan York — Wed, 01 Dec 2010 22:08:29 +0000

Want to know what Phono is all about? What Tropo has to offer and how it is different from other services? And what all the cool things are that are brewing in Voxeo Labs?

If so, check out this latest episode of the ChangeLog podcast where host Wynn Netherland spoke with Voxeo Lab’s Chris Matthieu:

http://thechangelog.com/post/2052257896/episode-0-4-1-telephony-with-chris-matthieu

It’s a fun session where Chris goes into Phono, Tropo, Teleku, Adhearsion, AGItate and throws in some alphabet soup of TAPI, SAPI, SIP, XMPP and more…

Thanks got to the ChangeLog team for this great interview!

Adhearsion Goes 1.0

Jason Goecke — Thu, 28 Oct 2010 15:57:58 +0000

I am excited to announce that through Ben Klang’s stewardship Adhearsion goes 1.0 at Astricon today! From the announcement:

Thanks to the hard work of many people in the Adhearsion community, I am pleased to be able to announce the immediate availability of Adhearsion version 1.0. Since Jay Phillips first began work on the project in 2006 Adhearsion has changed the way developers think about telephony applications. Now with several years of operating experience and multitudes of applications deployed to production, it is time to acknowledge this important milestone.

What does Adhearsion 1.0 mean?

A battle-tested API. Adhearsion 1.0 has defined a well-tested API and it has been proven with over two years of real-world deployment experience.

A “stable” branch. Adhearsion’s exposed API will remain stable throughout this major version number series. No backward-incompatible changes will be made, making it safer for developers to trust future upgrades.

Updated documentation. Thanks to Justin Dupree of Tropo, Adhearsion’s docs received a lot of TLC in the form of content updates and a migration to Github Wiki. Check them out at docs.adhearsion.com

Gem-based Components. The final feature added to Adhearsion prior to 1.0 is the ability to install and use components via RubyGems. Learn more about that in the Gem-based Components wiki page here (http://github.com/adhearsion/adhearsion/wiki/Gem-based-components).

To get your hands on Adhearsion 1.0 run, don’t walk, to your nearest command line and issue a:sudo gem install adhearsion

As always, don’t be a stranger. We can be found on the Adhearsion mailing list (http://groups.google.com/group/adherasion), in IRC (irc.freenode.net #adhearsion) and on the Adhearsion website (http://adhearsion.com). – Ben Klang

And if you are at Astricon, be sure to come and see us talk about Adhearsion today at 1.45pm in National Harbor room #6.

Join Us to Talk About Adhearsion at Astricon

Jason Goecke — Tue, 19 Oct 2010 17:06:16 +0000

If you are headed to Astricon in National Harbor, MD next week, be sure to attend the Adhearsion talk at 1.45pm on Thursday October 28th. Ben Klang and I will be giving an overview of Adhearsion with Asterisk, as well as updating the community on all of the work we have been doing on Adhearsion since the last Astricon.

We look forward to making a big announcement there too. See you all there!

Phono.com Is Live!

cmatthieu — Sat, 16 Oct 2010 13:19:17 +0000

Voxeo Labs is extremely excited to announce our latest game-changing communications technology called PhonoSDK!

PhonoSDK is a simple jQuery Javascript plug-in that turns any Web browser into a multi-channel communications platform capable of placing and receiving VoIP telephone calls from the browser as well as handling real-time chat communications and more.

PhonoSDK allows jQuery developers to easily add and style a softphone in any web browser application and in minutes call any SIP address and receive calls to the SIP address dynamically create onReady. Many web services already speak SIP such as Tropo, Teleku, and Voxeo platforms. Tropo allows Web developers to build sophisticated telephony applications like banking IVR systems with a simple RESTful Web API that can be controlled by the user’s voice or touch tones from their browser using the PhonoSDK!

Keep an eyes on the Phono blog and @PhonoSDK on Twitter for updates on new features! In the mean time, get your free copy of the PhonoSDK today at http://phono.com/download.

BIG Announcement – Stay Tuned!

cmatthieu — Tue, 12 Oct 2010 16:58:34 +0000

Voxeo Labs will be making a BIG product announcement at the sold-out jQuery Conference in Boston this weekend (10/16 – 10/17)!

All we can say in advance of the announcement is that our new product is going to be a disruptive and game-changing competitive weapon in the communications industry. Stay tuned to our @Voxeo Twitter account, blog, and new product site for up-to-the-minute news about this weekend’s launch!

Phono.com Is Live!

AGItate Screencast Series with Adhearsion and Asterisk

Jason Goecke — Fri, 08 Oct 2010 13:49:27 +0000

We have been working hard to show how to install, use and get the most out of AGItate. Have a look on the Tropo Blog for these posts and more to come:

These show you how to seamlessly meld your existing Asterisk server with services from the Tropo cloud. Enjoy!

Introducing GWOB Marketplace

cmatthieu — Mon, 04 Oct 2010 17:54:20 +0000

As GWOB‘s 10.10.10 Hackathon approaches, Voxeo Labs lended an early hand by creating a marketplace for the GWOB communications applications for the next weekend’s contest apps and future applications designed to save the world in times of crisis.

We cloned the AhnHub.com application that we created and highlighted in our previous post. This open-source GitHub directory application has proven to be beneficial in helping organize developer projects in different GitHub repositories by simply including a post receive hook (http://gwob.heroku.com) in your repository. Your GWOB application is automatically added to the GWOB marketplace and all future commits are synced with the directory to showcase updates. Please visit http://gwob.heroku.com/how for instructions on how to add a post-receive hook to your GWOB application!

We are excited to see what you come up with at your local GWOB 10.10.10 hackathon! Save the world by joining your local hacker space like (@GangPlank and @Nextspace) on 10.9.10 through 10.10.10 and submit your crisis communications app to the GWOB marketplace!