spandsp: spandsp (DSP library for telephony)
spandsp:
spandsp: SpanDSP is a library of DSP functions for telephony, in the 8000
spandsp: sample per second world of E1s, T1s, and higher order PCM channels.
spandsp: It contains low level functions, such as basic filters. It also
spandsp: contains higher level functions, such as cadenced supervisory tone
spandsp: detection, and a complete software FAX machine.
spandsp: The software has been designed to avoid intellectual property issues,
spandsp: using mature techniques where all relevant patents have expired.
spandsp: See the file DueDiligence for important information about these
spandsp: intellectual property issues.
spandsp:
spandsp: http://www.soft-switch.org/