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The firmware is Firmware version 58.04.76

Dear friends thanks for the replies and let me answer to your questions. El valiente you are right I cannot change it through the interface. I don't know linux etc... I search inside before I post and you are right that there are a lot of methods but not what I am asking . I'm asking...

Dear friends, I'm happy to be here to you community. Please let me know if there is any method to convert Fritzbox PSTN Annex A International to ISDN Annex B International ? Thank you