On an Cisco 3620 we installed an PRI Dial In Interface an we also installed a 30 -port Digital Modem Module.
The router handles the calls with and without callback.
With direct Dial in everything works well, also with ISDN calls with dialback.
Direct Analog Dial in works also well, but if we make a analog call in with callback the previous connection fails and the new connection takes place.
Any suggestion ????