AudioCodes Mediant 2000 System - ISDN Overlap Dialing

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SIP User's Manual 386 Document #: LTRT-68806

Mediant 2000 & TP-1610 & TP-260/UNI

Table 9-2: Mapping of SIP Response to ISDN Release Reason

SIP Response Description

ISDN Release

Reason

Description

505* Version not supported 127 Interworking

600 Busy everywhere 17 User busy

603 Decline 21 Call rejected

604 Does not exist anywhere 1 Unallocated number

606* Not acceptable 38 Network out of order

* 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