Media is another vital component of a Unified Communication system. Once signaling is in place and working between two endpoints, information about media capabilities can be transferred, eventually allowing for streaming audio, making video calls, or exchanging other information.
In this blog article we will analyze what technologies are used to transfer information about available media between endpoints.
SDP (Session Description Protocol) is a format for describing streaming media initialization parameters standardized by IETF in 1998.
What follows is the Session Description fields usage and an example:
This time we will talk about transport protocols over the web, in particular, about BOSH and WebSocket.
Besides TCP (XMPP/SIP) and UDP (SIP only) transports, two other transports, BOSH and WebSocket, are available which are embedded inside existing TCP/HTTP stacks.
Bidirectional-streams Over Synchronous HTTP (BOSH)allows real-time communication between a browser and a web server. The browser connects to the server and will keep the connection open as long as it has no data to send. When data is available, the server sends it over the open HTTP connection and closes the connection itself. This reduces the number of requests, as the browser is not continuously polling the server. The server retains a cache of events that the client missed between reconnections.
Web, Hybrid or Native Mobile apps – which one to choose? In the previous blog article we discussed web-based communication solutions and their advantages over native ones. This time we will discover why it is more preferable to use native or hybrid applications for mobile devices.
Mobile devices like smartphones and tablets have two important limitations:
CPU and battery usage
Because these two factors must be taken into account, collaboration apps for mobile phones must still be native or hybrid apps. Native means using Objective-C and Swift (with iOS devices) and Java (with Android devices). Hybrid means that a mix of native code and Webviews are included in the app.