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Executes Zaptel ISDN RAS application

  ZapRAS(args): Executes a RAS server using pppd on the given channel.
The channel must be a clear channel (i.e. PRI source) and a Zaptel
channel to be able to use this function (No modem emulation is included).
Your pppd must be patched to be zaptel aware. Arguments should be
separated by | characters.