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Cisco 1841 modem dial in problems

Hi all,

I got a problem with a Cisco 1841. This router has 2 modules with 4 analog modems. The modems are connected to the telephone line wich are working fine.

To this router I connect in case of a backup with 4 external analog modems connected to a cisco 3640 with serial interfaces.

It works for 2 years and now let say from one to day to another it does not work.

The modems dial but get no answer from the modems of the 1841 and the connection does not establish.

What can be the problem ?

The 1841 router is restartet and the external modems from the 3640 are also resettet but no connection.

attached you will find the config of the cisco 1841.

I also get no debug output from the async interfaces of the 1841

Could it be that incoming calls are rejected ?

Dialer Interface is up and spoofing

Thanks a lot