User`s guide

Dialogic
®
System Release 6.0 PCI for Windows
®
Release Update, Rev 62 — January 30, 2008 225
Dialogic Corporation
Since not all switches operate this way, setting the channel block timer is optional.
When enabled, the channel block timer is started upon the sending or receiving of the final
clearing message on a particular channel (clearing message could be RELEASE or
RELEASE COMPLETE), and that channel will not be able to accept another call until this
timer has expired.
• If a call is received on a channel while the channel block timer is still running, and if
the Channel ID IE is set to “Preferred” or “Any Channel”, then the call is simply routed
to the next available B channel.
• However, if the Channel ID IE is set to “Exclusive”, or if no B channel on the board is
available for which the block timer condition is met, then the call is rejected with ISDN
cause 44.
1.56.2 New Parameter
The new parameter in the ntt.prm file to set the channel block timer is:
;--- The NTT Channel Block Delay value. LSB is 10 ms.
;--- This is a 2 byte value, but the maximum that will be considered is 255, or 0xFFH.
;--- If a value more than 255 is specified then 255 will be considered.
;
;--- The default value is 00H.
003C 00
The channel block delay time (003C parameter) can be set from 0 to 255, where the
values are increments of 10 milliseconds. For example, a setting of 255 = 255 x 10
milliseconds or 2.55 seconds of delay. Parameter values must be entered in hexadecimal,
so 255 would be entered as FF.
Typical values for this timer have been found to lie in the range of 0.7-1.0 second.
Any non-zero value enables the channel blocking feature for the specified time. The
default value for the parameter is zero, which disables the channel blocking feature.
The ntt.prm file is installed in the data subdirectory of the Dialogic
®
Software home
directory (normally C:\Program Files\Dialogic\data). For further information about JCT
board configuration, see the Dialogic
®
Springware Architecture Products on Windows
®
Configuration Guide.
1.57 Mixing ISDN and CAS on Dialogic
®
DM/V-B Boards
With the Service Update, you can now mix ISDN and CAS protocols on the same
Dialogic
®
DMV600BTEP or DMV1200BTEP Media Board, with automatic A-law/Mu-law
conversion.