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Isdn overlap dialing, On pa, 3 isdn overlap dialing – Nortel Networks Mediant TP-1610 SIP User Manual

Page 140

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Mediant 2000 SIP

Mediant 2000 SIP User’s Manual

140

Document #: LTRT-72504

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

Table

6-6

on page

122

):

ISDNRxOverlap

ISDNRxOverlap_x

TimeBetweenDigits

MaxDigits

ISDNInCallsBehavior