Say you have a small Asterisk installation with a single outgoing Zap channel and you want to throw a bunch of call files at it.  If you move them all into the outgoing directory at once, Asterisk will try to call them all and only the first one will work.  The rest will all fail because the channel is unavailable.  What you need is a way to move them one at a time into the outgoing directory. 

This pair of bash scripts does just that: (Note the popast script runs forever.)

popast 

#!/bin/bash
#script to sanely move call files
echo popast: checking for files2
while [ 1 ] ; do
    echo popast: inwhile1
    while [ -e /var/spool/asterisk/outgoing/*call ] ; do
        echo popast: inwhile waiting for call completion
        sleep 5
    done
    echo popast: calling mvfile
    mvfile queued/*call
done
echo popast: done

mvfile

#!/bin/bash
#script to sanely move call files
echo mvfile: $1
mv $1 /var/spool/asterisk/outgoing/
 

Cisco routers support static and dynamic routing, and there are more than one way to configure these routes.  This HowTo describes a way to configure a static route.  Say you have installed a VPN Appliance to connect your network to a business partner's network.  Your network uses the 10.0.0.0/8 private addressing scheme, thus allowing you to use any valid IP address within the 10.x.y.z address range.  Your router has been assigned the IP address of 10.0.0.1. 

Your new business partner uses addresses in the 192.168.0.0/16 network, allowing them to use any valid IP address in the 192.168.y.z address range.  They have provided you with a VPN appliance that you connect to your network and assign the local address of 10.9.0.99. 

You need to tell your router at 10.0.0.1 that the 192.168.0.0/16 network is accessible through 10.9.0.99.