AudioCodes Mediapack mp-11x, Руководство пользователя

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SIP User's Manual 336 Document #: LTRT-65409
MediaPack Series
7.3.1.4 DID Wink
The gateway's FXO ports support Direct Inward Dialing (DID). DID is a service offered by
telephone companies that enables callers to dial directly to an extension on a PBX without
the assistance of an operator or automated call attendant. This service makes use of DID
trunks, which forward only the last three to five digits of a phone number to the PBX. If, for
example, a company has a PBX with extensions 555-1000 to 555-1999, and a caller dials
555-1234, the local central office (CO) would forward, for example, only 234 to the PBX.
The PBX would then ring extension 234.
DID wink enables the originating end to seize the line by going off-hook. It waits for
acknowledgement from the other end before sending digits. This serves as an integrity
check that identifies a malfunctioning trunk and allows the network to send a re-order tone
to the calling party.
The "start dial" signal is a wink from the PBX to the FXO gateway. The FXO then sends the
last four to five DTMF digits of the called number. The PBX uses these digits to complete
the routing directly to an internal station (telephone or equivalent)
„ DID Wink can be used for connection to EIA/TIA-464B DID Loop Start lines
„ Both FXO (detection) and FXS (generation) are supported
7.3.2 Telephone-to-IP Calls
The FXO gateway provides the following FXO operating modes for Tel-to-IP calls:
„ Automatic Dialing
„ Collecting Digits Mode
„ Ring Detection Timeout
„ FXO Supplementary Services
•
Hold/Transfer Toward the Tel side
•
Hold/Transfer Toward the IP side
•
Blind Transfer to the Tel side
7.3.2.1 Automatic Dialing
Automatic dialing is defined using the
ini
file parameter table TargetOfChannel (refer to
'Analog Telephony Parameters' on page 294 ) or the embedded Web server's 'Automatic
Dialing' screen (refer to 'Automatic Dialing' on page 149 ).