Siemens manual says
Busy tone: No codec match between the calling and called party.
Trace below is S685 calling A580, and hanging up before answer.
Remember if the called phone picks up, the call works fine.
  Geek |
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Uber Geek  Trusted WorldxChange |
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Geek |
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Uber Geek Trusted WorldxChange |
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Geek |
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Uber Geek Trusted |
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Uber Geek Trusted WorldxChange |
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... 4 5 6
... 12 13 14
... 94 95 96
... 2
... 367 368 369
... 2
... 2 3 4
