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8.3
ISDN Overlap Dialing
Overlap dialing is a dialing scheme used by several ISDN variants to send and / or receive called
number digits one right after the other (or several at a time). As opposed to the enbloc dialing
scheme in which a complete number is sent.
The Mediant 2000 can optionally support ISDN overlap dialing for incoming ISDN calls for the
entire gateway by setting 'ISDNRxOverlap' to 1, or per E1/T1 span by setting 'ISDNRxOverlap_x'
to 1 ('x' represents the number of the trunk, 0 to 7).
To play a Dial tone to the ISDN user side when an empty called number is received, set
'ISDNINCallsBehavior = 65536' (bit #16) causing the Progress Indicator to be included in the
SetupAck ISDN message.
The Mediant 2000 stops collecting digits (for ISDN IP calls) when:
•
The sending device transmits a "sending complete" IE in the ISDN Setup or the following
Info messages to signal that no more digits are going to be sent.
•
The inter-digit timeout (configured by the parameter 'TimeBetweenDigits') expires. The
default for this timeout is 4 seconds.
•
The maximum allowed number of digits (configured by the parameter 'MaxDigits') is
reached. The default is 30 digits.
Relevant parameters (described in
•
ISDNRxOverlap
•
ISDNRxOverlap_x
•
TimeBetweenDigits
•
MaxDigits
•
ISDNInCallsBehavior
Mediant 2000 SIP User's Manual
Table 6-6
on page 122):
140
Mediant 2000 SIP
Document #: LTRT-72504
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