Telephone-To-Ip Calls - 3Com VCX v7111 User Manual

Interruption of RTP stream
Relevant parameters: BrokenConnectionEventTimeout and
DisconnectOnBrokenConnection.
This method operates correctly only if silence suppression is not used.
Protocol-based termination of the call from the IP side
The implemented disconnect method must be supported by the CO or PBX.
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

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
Blind Transfer to the Tel side
Hold/Transfer Toward the IP side
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3Com VCX V7111 VoIP Gateway User Guide