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The better way to interconnect your Asterisk based PBXs to the PSTN infrastructure is by a dedicated Voice Gateway. Thanks to, your telephony infrastructure, will benefit of a rich bunch of features: Dedicated DSP equipment. Powerful transcoding capabilities. Advanced call-routing. Failover & Load Balancing. Many of above were unable to deploy by a PCI Card!!! [...]

One of the major problem in an Asterisk IVR production is the file audio conversion. Asterisk is able to playback a wide variety of file formats but the prefferred are following: – GSM – A-law – U-law Sound eXchange is the better way to accomplish this job. Sox installation is quite simple: # apt-get install [...]