Huawei IAD108A User Manual page 141

User Manual
U-SYS IAD108 Integrated Access Device
identifies the start and end time of the conversation by the polarity
reversal of the subscriber line to which the ASI board is connected,
and in this way it realizes polarity reversal charging.
If the IAD108 coordinates with the MGC to send the polarity
reversal signal, either the IAD or the MGC can be configured to control
the polarity reversal signal. However, it is recommended to select the
MGC, that is, to set system parameter 23 of the IAD to 0 and set the
polarity reversal at the subscriber port to "reverse". Surely, the IAD can
also be selected according to the actual condition.
Caution:
When the IAD is set to control the polarity reversal charging signal, the subscriber
polarity reversal parameter of the MGC must be set to "no". Otherwise, there will be
repeated charging.
If the IAD is set to control polarity reversal charging, the PSTN
port has to be configured with polarity reversal charging as well as the
system parameter 23 that controls the polarity reversal charging signal.
To modify a
system-parameter.
Example:
Configure the attributes of port 0: Set the gain type of the PSTN
access user to 6 and enable pulse dialing and polarity reversal
charging at the PSTN port.
IAD2000(config)#pstnport attribute set 0 6 enable reverse
system parameter,
5-4
Chapter 5 Advanced
Configuration
use the command mg