The Great world of Lync UC SDK

After some time , i decide to write this post to share some of my thoughts about Lync developing. Some time ago I’ve wrote a Lync plugin (CallViaPhone app ) that let to use Lync client to start calls directly from an ip-phone, and it gave me a lot of challenges . So, questions could be :

  • Why do I need to develop an application for Lync ?

Professionals that know Lync , know that a lot of features are still not available (or not designed at all) and sometimes this lack of features, could move customers decisions to another technology. In this case we could “extend” Lync with SDK. A good example of cauldron of ideas could be :  .

  • Where should I start and what approach should I have?

First of all , we must have little confidence about developing, example could be install Visual Studio and try to develop some “hello world” application on different enviroments like WPF (XAML) to develop Windows applications with rich graphical interface, or console applications to develop Windows services , or .NET web applications , web services , and so on. But the question could be, why should I have to learn all of these ? Because we need to have a 360° vision and we must use the right enviroment for the project.

Secondly we must have clear what we want to do : do we need a client application to extend Lync client , or we need to develop a server side application centralized for all users , or both? In all of these case we could find a lot of example on how to do it . A good starting point could be this : , in which there is a lot of explanations about these :

  • Lync 2013 SDK (client side)

– These API gives you the possibility to control almost all Lync client behavior ,and interact with it. Example could be CRM integrations , client PBX integration , etc…

– There are also the option to add some custom menu in Lync interface to call applications or web url with registry key; for more information visit :

– One of the most advantage of Lync Client API , compared to the others Lync API, is that you can develop also in a Office365 enviroments without the needs of a Lync On-Premisev env.

  • Lync Server 2013 SDK (server side)

– With these API you can manage,  in Lync Front End role , all sip communications. This means that, for example, i would like to create the BusyOnBusy feature (actually missing from Lync features)  , so i could develop a “Sip application”  with the “SIP application manifest” (MSPL script) that intercept a call if the user lync called is actually in another audio call.

– Another way to use Lync Server 2013 SDK is to develop a “Managed SIP applications API” ;  the mode is similar to MSPL script , indeed you must start from a MSPL script that route (forking or forwarding) the sip signaling to one or more specific endpoint, and then you can develop a .NET application that manage it. An example could be a reporting third party solution, or some advanced applications that take care of all Lync conversations .

  • UCMA 4.0 (Server side)

– With UCMA we can develop almost all of advanced features needed in enterprise scenario , for example , based on business needs we can develop a full functionally contact center with IVR (not response Group 🙂 ) , routing logic and so on. Great advantage is that we can extend it with all lync communications channel  , such as Audio, Video, IM, federation, Public (Skype, etc…) . UCMA give us also all tools that typically you have to pay so much with other vendors , for example : “Text To Speech”, “Speech Recognition” in a IVR enviroment.

  • UCWA 1.0 (web side :))

–  Unified Communications Web API ,  actually with these API you can develop your own web applications with some features like authentication, presence, IM and the Call Via Work (you simply manage the call forwarding , simultaneosly call, of your lync user) . We hope as soon as they will be ready , also Audio, Video and other lync features could be used in web applications. .

  • Lync Software Defined Networking (SDN) API

– Imagine that you are at carrier side and you have to monitor some indicators for Lync quality , network performance , etc.. You have to integrate all of these in a third party monitoring system  ; these API is exactly what you need; take a look at this for other informations : . A very interesting tool inside this API is the “SIP Obfuscator” that let you to hide username for privacy.


We have a lot of other sources to read about Lync SDK, for example these resources below are absolutely useful and saved my time in a lot of situations   :

Remember that deep knowledge of Lync API is not enough to develop a Lync applications ready for the market , we have to consider that there are a lot of aspects in terms of exceptions, enviroments , usability , integration with other not Lync application  , licensing , security, and so on .

A lot of companies today invest in Lync developing , awesome example are :


CallViaPhone Advanced new feature for Outlook 2010/2013

Hi all,
I am pleased to announce a new version of CallViaPhoneAdvanced 2013 . As already mentioned in my previous posts,  CallViaPhone application,  through Lync interface, can be used to make and handle calls (similar to Better Together features of snom and polycom) to your phone (make call, close, hold, transfer, conference) , for more details please refer to this post CallViaPhone post detailed description .
Here below you can find new features of this version more in deep :

  • One of the most important new feature added is  that, from now, you can also use Microsoft Outlook 2010/2013, regardless of Lync. So the “call by phone” can be made ​​as described below:
    • From contacts in mail header or in appointment header:


  • From Outlook Contacts Folder :


  • New menu in configurator to use CallViaPhone with these ip-phone models :


    • Snom Phones (default selection)
    • Cisco ip-phone (require some configuration on Cisco Call Manager, with this version we don’t have yet features like Close call, Hold Call, transfer call and conference call and Incoming call feature)
    • Yealink ip-phones (not available Incoming call feature)
    • Automatic check for new applications updates

You can download full version  (15 days limited) :

  • If you don’t have Lync  installed you can install any of these above for using Outlook callviaphone feature.
  • If you already have an old version of CallViaPhone , you don’t have to uninstall it, just install over.

For any questions don’t hesitate to contact or

Auto Answer Video Kiosk application for Lync 2010/ 2013

Hi all,

about 1 year ago Scott Hanselman  wrote an awesome lync tool named Lync 2010 Super Simple Auto Answer Video Kiosk with Full Screen, you can find a complete description  here :

Full Description of Super Simple Auto Answer Video Kiosk with FullScreen

Basically this tool let you to turn any PC in a complete “auto remote working machine” just calling it from Lync .

This can be very useful in any situations in which we have to connect, without human intervention, in that PC . For example it can be used to see, with video, what’s happening in that place, or simply when you want to show Lync feature during sales presentations.

Usage is very simple, just start Lync 2010 or Lync 2013 ,(binaries version below is with NotUISuppressed, this mean that you have to start Lync client before launching AutoAnswer) , go to SuperSimpleLyncKiosk.exe.config  file and insert your sip uri  like this :

<setting name=”sipEmailAddress” serializeAs=”String”>

and Save.

Ready to work , just open SuperSimpleLyncKiosk.exe and enjoy 🙂

Just a couple of months ago , i saw that there’s not a direct download to binaries , for this reason I contact Scott asking him the permission to publish  binaries , thanks Scott!! 🙂

So for who that doesn’t have a way to compile a Visual Studio project , here below you can find the executable :

Personally i learn a lot seeing code of this tool, and for this i thanks another time Scott for his job.

Obviously all credit goes to Scott 🙂