hello carl
for triggering an isdn line, you should have the route and interesting traffic defined at the end location (which triggers the call). In any case , you should have the routes on the other end too, for sending the return traffic through the isdn line....
hence , for triggering or setting up calls its enough to have route one way, but for complete routing of packets, you need to have it both ways..
hope this helps.. all the best... rate replies if found useful..
Raj
