oozenoz

Companding should not be selected based on the type of device; it should be selected based on where the device is installed. mu-Law is NA standard, A-Law is ITU-T standard which is used just about everywhere else. If you are connecting to the PSTN in the US, you would have to use mu-Law because the two algorithms are not compatible - a connection where A-Law is used on the transmit side and mu-Law when received will result in a highly distorted signal after it is decoded and converted.

Best practice is to use the same companding for all traffic routing over a single interface.

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- calvin