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Session Initiation Protocol - SIP Book
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Direct Inward Dialing - DIDDirect Inward Dialing (DID) connections are trunk-side (network side) end office connections. The network signaling on these 2-wire circuits is primarily limited to 1-way, incoming service. DID connections employ different supervision and address pulsing signals than dial lines. Typically, DID connections use a form of loop supervision called reverse battery, which is common for 1-way, trunk-side connections. Until recently, most DID trunks were equipped with either Dial Pulse (DP) or Dual Tone Multifrequency (DTMF) address pulsing. While many wireless carriers would have preferred to use Multifrequency (MF) address pulsing, a number of LEC's prohibited the use of MF on DID trunks.
Direct Inward Dialing (DID) Operation
This figure shows the basic operation of direct inward dialing in a PBX system. This diagram shows how a caller has dialed a person in a company through the public telephone number. When this call is received by the end office (EO) switch in the public telephone company, the public telephone operator connects the call to one of the available incoming trunk lines between the telephone company switch and the PBX switch. This example shows that in addition to connecting the call and sending an alert (ringing) signal, the called number is also sent to the PBX. This allows the PBX system to lookup the called number to determine which extension the call should be connected to. The PBX system then connects the incoming trunk line to the correct telephone extension.
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Session Initiation Protocol - SIP Book
This book explains why people and companies are using SIP equipment and software to efficiently upgrade existing telephone systems, develop their own advanced communications services, and to more easily integrate telephone network with company information systems. This book also provides descriptions of the function parts of SIP systems and operations. $19.99 Printed, $16.99 eBook |
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