On 07/25/2013 06:07 PM, grarpamp wrote: > Presuming this is same as your 'CDPD', this is their take on it, > called CSD ... > > http://www.cryptophone.de/en/background/cryptophone-technology/transport-technology/ Yes, sorry I meant CSD, not CDPD. This is not a data plan line though. It is a modem/fax line, not packet data.