Transcoding SIP gateway

Abstract: In todays multimedia society more and more communication is becoming
digitized. However under a temporary period, digital and analog techniques
must coexist. So that every one can communicate with everyone else.
For the deaf community, among other things, this means connecting analog text
telephones to new internetbased technology. To enable this coexistance the
Telecommunication Access Rehabilitation Engineering Research Center of the
University of Wisconsin, Trace Center joint with Gallaudet University, and
Omnitor AB have presented a idea of how this can be achieved.
This report describes a project, which shows how a gateway can be designed
and implemented. A gateway that has the features of enabling communication
between analog text telephones and internet based clients. Enabling the
users to
communicate with both voice and text regardless if the users are using
analog or digital media.
The implementations in this project are done in Java. So the resulting
gateway is as operating system independent as it can be.
The result of this work was a gateway that can separate vice and analog text
telephone signals in a in coming sound stream. The separation is good enough
so as not to influence a conversation through the gateway.