I would get together with who ever configures the SNA gateway and make sure that the settings on the gateway match those on the interface. If the gateway settings are good maybe check with the VTAM folks to make sure it matches. Noticed the clockrate...

Do you have an access list set up so that only significant traffic will cause an isdn call to initiate. We use the following format:access-list 100 deny eigrp any anyaccess-list 100 deny ip host 255.255.255.255 anyaccess-list 100 permit ip anydialer-...

All the responses you have gotten are right. You can have the user check the Network card on the AS400 it could be faulty. If this has been done or the card has been replaced try reseating the cable or moving the device to another serial interface an...