You have been blocked. But unlike an iPhone, where a simple trip to Settings reveals a list of silenced contacts, a landline is a labyrinth of carrier codes, star codes (star codes are special sequences of keys on your phone's keypad that start with the star (*) button), and decades-old telecommunications infrastructure.
If you call from a friend's phone and it goes through, but yours doesn't, it's a local block on their physical machine. how to unblock a number landline
Send a letter. Send an email. Ask them to check their cordless phone’s base station for a "Blocked Calls" menu. There is no remote code for this. The Deep Technical Play: The "Anonymous" Reset If you are trying to unblock your own landline because you blocked a number accidentally, you have power. Unlike mobile phones, landlines often use old school star codes for management. You have been blocked