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Router 3825 isdn up isdn down

hi.

i configure a BRI interface for Voice IP.

Everythin is ok, bet the ISDN interface BRI 0/0/0 no work correctly.

in debug i can see.

Layer 2 for interface BR0/0/0 TEI 82 change to up.

In 1 second.

Layer 2 for interface BR0/0/0 TEI 82 change to down.

In 2 seconds

Layer 2 for interface BR0/0/0 TEI 82 change to up.

and now again ....

Layer 2 for interface BR0/0/0 TEI 82 change to down.

can help me.

Regards

Alfonso

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