A ring tone company that two years ago was seeding the market by hitching a free ride on a U.S. carrier's network is now selling tones to Nextel Communications subscribers, the two companies announced ...
Recall dial tone-13 dBm0 3 bursts of 0.1 s followed by a continuous tone (note c) Recall dial tone Modern PABX only (note g)-16 dBm0 3 bursts of 0.1 s followed by a continuous tone (note c) Busy ...
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