Isdn Overlap Dialing; Using Isdn Nfas - 3Com VCX V7122 User Manual

Table 32 Calling Name (Display)
DMS-100
NT TE Yes
TE NT Yes
Table 33
Redirect Number
DMS-100
NT TE Yes
TE NT Yes

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 VCX V7122 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, 0–7).
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 VCX V7122 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

Using ISDN NFAS

In regular (non-NFAS) T1 ISDN trunks, a single 64 kbps channel carries signaling for the
other 23 B-channels of that particular T1 trunk. This channel is called the D-channel and
usually resides on timeslot # 24.
144
NI-2 4ESS/5ESS
Yes No
Yes No
NI-2 4ESS/5ESS
Yes Yes
Yes Yes
Table 30 on page 133):
3Com VCX V7122 SIP VoIP Gateway User Manual
Euro ISDN
Yes
No
Euro ISDN
Yes
No