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In telecommunication, signalling (UK spelling) or signaling (US spelling) has the following meanings Signalling systems can be classified according to their principal properties, some of which are described below In the public switched telephone network, (PSTN), in-band signalling is the exchange of signalling (call control) information within the same channel that the telephone call itself is using. An example is DTMF signalling, which is used on most telephone lines to exchanges. The term Compelled signalling refers to the case where receipt of each signal needs to be explicitly acknowledged before the next signal is able to be sent.
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