actually many apartment buildings in the US hold control of the telephone lines for their building. They buy lines in bulk and then re-sell them to their tenants. If your telephone service is included in your rent or billed by the apartment manager, then you should not be calling the telephone company yourself, its a building manager problem. if you had to setup your own phone service when you moved in, then call the telco yourself and forget notifying the building manager.
Fast busy after 1-2 rings is a common symptom of a bad mapping on a DID assignment, which would indicate that the building is purchasing bulk lines and then reselling them to the occupants.
a good way to determine if its the line or your telephone is to simply disconnect all phones, modems, anything connected to the phone lines, then call your own number from a neighbor or cell phone. if it rings and then busys out, its a telco / apartment switch problem. if it rings endlessly, then you have a bad phone, modem, or other device attached to your lines, re-connect things one at a time, calling yourself inbetween each connection, until the error appears and you've found the culprit.
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