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+Theoretically all combinations of 30 tones could be assigned to 27405 different subscribers.
+Only 24375 combinations can be encoded with the last 5 digits, because some digit combinations do not define 4 different tones or would generate the same 4 tones as other digit combinations do.
+The actual limitation of subscribers were cause by the limited number of available channels.
+</p>
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+<p>
4. Release by the mobile station
<br><br>
If the user hangs up, the mobile station transmits a continuous 1750 Hz release tone.