Isdn Overlap Dialing - AudioCodes Mediant 2000 System User Manual

Table 9-2: Mapping of SIP Response to ISDN Release Reason
SIP Response
505* Version not supported
600 Busy everywhere
603 Decline
604 Does not exist anywhere
606* Not acceptable
* Messages and responses were created as the 'ISUP to SIP Mapping' draft doesn't
specify their cause code mapping.
9.3

ISDN Overlap Dialing

Overlap dialing is a dialing scheme used by several ISDN variants to send and / or receive
called number digits one after the other (or several at a time). This is as opposed to en-bloc
dialing in which a complete number is sent.
The gateway can optionally support ISDN overlap dialing for incoming ISDN calls for the
entire gateway by setting the ini file parameter ISDNRxOverlap to 1, or per E1/T1 span by
setting ISDNRxOverlap_x to 1 (where x represents the number of the trunk -- 0 to 7). For
configuring ISDN overlap dialing using the Embedded Web Server, refer to 'Trunk Settings'
on page 178.
To play a Dial tone to the ISDN user side when an empty called number is received, set
ISDNINCallsBehavior = 65536 (bit #16). This results in the Progress Indicator to be
included in the SetupAck ISDN message.
The gateway stops collecting digits (for ISDN-to-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.
A match is found with the defined digit map (configured by the parameter,
DigitMapping).
Relevant parameters (described in 'PSTN Parameters' on page 307):
ISDNRxOverlap
ISDNRxOverlap_x
TimeBetweenDigits
MaxDigits
ISDNInCallsBehavior
DigitMapping
SIP User's Manual
Description
Mediant 2000 & TP-1610 & TP-260/UNI
ISDN Release
Reason
127 Interworking
17 User busy
21 Call rejected
1 Unallocated number
38 Network out of order
386
Description
Document #: LTRT-68806