Either way, as depicted in the following simplified diagram, the signaling and media paths are basically the same in that they both must traverse the entire backend infrastructure. The Lync to Skype scenario is quite different though as this use-case is more about bridging enterprise and consumer solutions in which it can be argued that the two clients would rarely be on the same network. So in the event that a Skype user is calling a Lync user on the same network the media would take the long way around and effectively be hairpinned back into the same network.įor native Lync connectivity the topic of media traversal is well documented and the value of negotiating a direct media connection can be quite obvious. So even though the calls are basic peer-to-peer scenarios the media must still traverse the Skype back-end infrastructure regardless. The signaling gateways in the Skype cloud would then facilitate the connections between the different clients allowing each to negotiate a media connection with the media gateways. This “Version 1” capability was actually provided by use of media transcoding gateways in the Skype cloud which would allow both clients to utilize their own, unique pre-existing audio codecs. Last year Microsoft added support for peer-to-peer audio calls between Lync 2013 clients and newer Skype clients. While most of this new information was focused around direct video compatibility with Lync 2013 clients, there will be some advancements in audio calling as well. BackgroundĪt the latest Lync Conference Microsoft released more details regarding further integration plans between Lync 2013 and Skype. This article has been in the works for a while and in the meantime fellow MVP Johan Delimon has also posted a brief article covering just the audio codecs in Lync 2013. But due to the latest announcements around Lync and Skype integration it seems appropriate to first take a closer look at one of these codecs in particular before diving into the rest.
The original intent of this article was to review the current list of supported audio and video codecs in Lync 2013 and attempt to explain what each one is used for given that the list has grown quite a bit over time.
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