search for: overcompression

We currently use asterisk 1.4.x with two Zaptel cards connected to POTS lines. So we make "outbound" calls from their softphones (using ulaw format), which go over a dedicated DSL line to the asterisk server in our office, which then converts the calls to POTS. This all works fine, assuming there aren't any unusual problems. It sounds as good as POTS on both ends. However, we

...to speex using a simple tape recorder-like interface (eg you can quickly rewind to your error, and continue from that point)? Is there any kind of filter/processor that will produce very compact low-bandwidth results so that playback sounds like telephone quality, without any of the scary digital overcompression effects? Can any user app play and seek speex streamed over http, and display and modify author/title/comments? Is there a way that someone listening to an audio book in Speex format can skip to a bookmark or to the next page? Is there a preprocessor that can help with spoken word that has music...