Advanced Pstn Configuration; Mediant 1000 Clock Settings; Isdn Overlap Dialing - AudioCodes Mediant 1000 User Manual

SIP User's Manual
11

Advanced PSTN Configuration

11.1

Mediant 1000 Clock Settings

The gateway can either generate its own timing signals, using an internal clock, or recover
them from one of the E1/T1 trunks.
To use the internal gateway clock source configure the following parameters:
•
TDMBusClockSource = 1
•
ClockMaster = 1 (for all gateway trunks)
To use the recovered clock option, configure the following parameters:
•
TDMBusClockSource = 4
•
ClockMaster_x = 0 (for all 'slave' gateway trunks connected to PBX#1)
•
ClockMaster_x = 1 (for all 'master' gateway trunks connected to PBX#2)
Assuming that the gateway recovers its internal clock from one of the 'slave' trunks
connected to PBX#1, and provides clock to PBX#2 on its 'master' trunks.
In addition it is necessary to define from which of the 'slave' trunks the gateway recovers its
clock:
TDMBusPSTNAutoClockEnable = 1 (the gateway automatically selects one of the
connected 'slave' trunks)
Or
TDMBusLocalReference = # (Trunk index: 0 to 3, default = 0)
Note 1:
Note 2:
11.2

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 en-bloc
dialing in which a complete number is sent.
The Mediant 1000 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 3).
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 1000 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.
A match is found with the defined digit map (configured by the parameter,
DigitMapping).
Version 5.0
To configure the TDM Bus Clock Source parameters, refer to Section
on page 166.
When the Mediant 1000 is used in a 'non-span' configuration, the internal
gateway clock must be used (as explained above).
11. Advanced PSTN Configuration
315
5.6.4
December 2006