Tactical Software Knowledge Base

Cisco routers with digital modems (Mica, NextPort) are not able to support dial-in back through DialOut/EZ.  The Cisco digital modems are not able to answer an incoming call while there is an active reverse telnet session to them.  If DialOut/EZ doesn't have a active reverse telnet session to the modem, then the application on the user's PC cannot see that the modem is ringing and thus cannot answer it. 

If you have a Cisco router with a digital modem, receiving an inbound call will be possible with our COM/IP program.  This won't let you make outbound calls, you'll still need DialOut/EZ to do that.

Cisco Configuration

The first step would be to configure the Cisco to make a raw TCP/IP connection to the workstation when the call comes to a specific modem.  Let's say the workstation is 10.0.0.1 and the port number will be 7000.  The configuration on the Cisco router to accomplish this on line 1 is: 
autocommand telnet 10.0.0.1 7000 /stream

This would make the Line Configuration look like this:

line 1
  modem inout      
  transport input telnet
  modem autoconfigure type mica
  autocommand telnet 10.0.0.1 7000 /stream
  escape-character NONE  (if using an AS5350 or 5400)
line 2 40
  modem inout
  transport input telnet
  modem autoconfigure type mica
  rotary 1
  escape-character NONE  (if using an AS5350 or 5400)

For each incoming line that you wish to redirect through COM/IP, the line "autocommand telnet /stream" will need to be added to a separate line in the Cisco configuration.

Client Configuration

Now on the PC (10.0.0.1) you'll need to install our COM/IP product and the COM/IP modem driver on the virtual COM ports that you create with COM/IP.  You can download COM/IP from this link:  COM/IP free trial request

In the Init String in COM/IP add the string:  ATS1008=7000 

This tells the COM/IP modem to listen to port 7000 for an incoming connection. 

Now set the application on the PC to use the COM/IP modem device installed on the COM/IP virtual COM port, and it will receive the incoming call that is redirected from the Cisco router.