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Cisco Bug: CSCsy79955 - PVDM2-xDM modems do not respond to AT commands in reverse ssh session

Last Modified

Jan 28, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

12.2XN 12.4T

Description (partial)

Symptoms: Reverse SSH using PVDM2 modems fails. If the <CmdBold>ssh -l
<username>:<line #> <ip><noCmdBold> command is entered, modem activation is
triggered.  The input of "atdt<number>" is making it to the modem, meaning
whatever the <number> field is typed, it is reported in the debugs.  However,
the modem does not send anything back to router about it and no connection is
made. At modem prompt, "at", "at&f", "ate1" (and perhaps others) do not appear
to be taken.

Conditions: Seen on routers running Cisco IOS Release 12.4(22)T and 12.4(23). 
Appears to be issue with all releases. Issue is seen when using both
<CmdBold>ssh -l <username>:<line #> <ip><noCmdBold> and by using SSH from a
client to a particular line.
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
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