I want to send to my carrier message "No route to destination when i receive a prefix I'm not supporting it , please how i can do that on AS5300 gateway
Are you using a soft switch behind the AS (e.g. PGW2200) or the AS is standalone?
Basically you should try:
AS5300(config-if)#isdn network-failure-cause 3
on the ISDN serial interface.
As per documentation this should work:
This command allows the original cause code to be changed to the value specified if the original cause code is NOT one of the following:
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