CHAPTER29 Analog Gateway
Mediant 1000 Gateway & E-SBC | User's Manual
DID Wink
The device'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
acknowledgment 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 device. 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.
● DID service for FXS interfaces is also supported.
FXO Operations for Tel-to-IP Calls
The FXO device provides the following FXO operating modes for Tel-to-IP calls:
■ Automatic Dialing (see Automatic Dialing)
■ Collecting Digits Mode (see Collecting Digits Mode)
■ FXO Supplementary Services (see FXO Supplementary Services)
● Hold/Transfer Toward the Tel side
● Hold/Transfer Toward the IP side
● Blind Transfer to the Tel side
Automatic Dialing
The SIP call flow diagram below illustrates Automatic Dialing:
- 710 -
To Next Page
Loading...
Need help?
General
