Addresses to Lines Assignments
An address is the telephone number, complete with national or international
codes, of a telephone, fax machine, or other device that can receive calls.
Addresses can be dialed by a human or stored in an electronic directory for
retrieval and use by a telephony application. For more complete information on
addresses assignments, channels, and lines, see Line Devices Overview
The local assignment of an address to a line (that is controlled in TAPI)
takes place in the setup operation for the service provider. This can be done using
the Control Panel to configure the service provider or by calling the lineConfigDialog
function from within the application. On the local side of the central
office, everything about a line is controlled by a service provider, such as whether
there are multiple addresses and what these addresses are.
Usually, there is exactly one address per line, with the following exceptions:
- Multiple Addresses with POTS. In POTS, multiple addresses work only with systems that support distinctive
ringing or are connected to a DID trunk. (DIDdirect inward dialingis an extra-fee service provided by the phone company.) With DID in a
multi-user voice mail system, the dialed number is signaled to the system on the DID
trunk before the call rings. This allows the system to play the called party's
pre-stored announcement message and to store any incoming messages in the correct
voice mail box.
On a residential line with distinctive ringing service, different ringing
patterns correspond to multiple numbers assigned to the same line.
- Multiple Addresses with ISDN. ISDN was designed to allow simultaneous multiple addresses by providing
multiple channels, each of which can have its own address. On an ISDN network, call offering (which means a call-setup message has been sent from the switch) takes place
before ringing, so the call can be redirected before it is answered. The lineAccept function means start ringing for ISDN. For POTS, it means that some application has accepted responsibility
for the call and has presented it to the user.
- Software for developers
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