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The signalling function of a telephone network is related to the transfer of control information between the different terminals, switching nodes and users of the network. Signalling functions can be divided into two types: Supervisory and Information Bearing. Supervisory signals indicate the status or control of network elements. Call alerting, call termination and busy tones are examples of Supervisory signals. Calling party address, toll charges and called party address are examples of Information Bearing signals.

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Q: What is the difference between inchannel and common channel signaling?
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What is the difference between in channel and common channel signaling?

One signaling path needed per trunk groupFaster and simpler to transfer information between control processorsNo possibility of interference with speech pathSignaling can't be accessed by customer.Value-added services of a signaling control pointShared processing for small officesAllows centralized decision making (flow mgmt)Permits Advanced Intelligent Network (AIN) services


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In telephony, signaling is the exchange of information between involved points in the network that sets up, controls, and terminates each telephone call. In in-band signaling , the signaling is on the same channel as the telephone call. In out-of-band signaling , signaling is on separate channels dedicated for the purpose.


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What type of signaling transmits call setup on the same channel as a voice signal?

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What is In- channel signaling?

In-channel signaling is also often referred to as in-band signaling. See http://en.wikipedia.org/wiki/Signalling_(telecommunications)#In-Band_versus_Out-Of-Band and http://en.wikipedia.org/wiki/In-band_signaling.The signaling used to establish and tear down a phone call was located in the same physical communication channel used to carry the call (i.e voice, fax or modem) traffic, and used DTMF tones. Examples are CCITT Signaling Systems 1-5 R1 & R2. Most books on SS7 should talk briefly about this.SS6 & SS7 moved to take the signaling out-of band, and to establish a common channel for all signaling in digital packet-based format (non-tone based) allowing one signaling channel to control a large number of "voice" circuits.


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provide information of the trunk itself carry on trunk....


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