Multimedia services in Asterisk based on VoiceXML

Abstract

The paper deals with multimedia services that cooperate with the Asterisk, as the communication server. Asterisk supports many services and we focused on the services that are not supported by native Asterisk. These services include recording and playback of video files, SOAP protocol support, VoiceXML and user location information. We put together all these services and created a comprehensive system. Its primary roles are performed by Asterisk. Our system enables users to save recorded video files directly to the server. Subsequently, they can replay their own videos or someone else’ files. Video files or IP cameras are easily selected by dialling a specific number. A video transmission similar to a video call is then automatically established. In our solution, the management provided by a web services server that uses SOAP protocol. User applications can use this SOAP interface to connect to Asterisk. The project is aimed in particular at users equipped with mobile end-user devices; certain services have been explicitly designed for these users. Transmission in mobile networks is limited in terms of transmission rates and latency. We defined limits for transmitting video streams in mobile networks.