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While I wait for the call to be answered I hear a "double ringing tone", like : expected tone : tuuu tuuu tuuu tuuu what I hear : tuuu tuuu tuuu tuuu tuuu tuuu tuuu tuuu the second "tuuu" I think is generated somewhere and not "true", since it sounds slightly different and the lambda between the first and the second is always different. the pr...

After reading a description of apparently the same problem by Juan J. Sierralta more detailed than mine "tuuu tuuu instead of tuuu" we've solved the problem changing the call progress tone of sip phones to something not udible.