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Call Suspend
The Call Suspend feature allows the telecom manager to reduce dialup ISDN costs by bringing down the
ISDN connection when all phones are inactive for a configurable period of time. When the line is
disconnected the phones will display that they are in the Call Suspend mode. Whenever a user goes off-
hook or an incoming call occurs, the ISDN connection is brought back up and all phones are taken out of
Call Suspend mode.
In addition, the Rlogin to remote and Copy file to remote features of the Management Interface also
cause the ISDN connection to be brought up and down as a phone would.
The Call Suspend feature has been designed with the assumption that if the ISDN connection is brought
down, it is possible to get busy signals from the ISDN network preventing the extenders to communicate
causing an interruption of phone service to the branch office. This assumption leads to setting the Call
Suspend timer to a value that will not allow the ISDN connection to go down during normal business
hours.
Note: The Call Suspend feature is configured at the remote site. Refer to the appropriate remote model
documentation for more information.
Normal Behavior
The expected usage pattern for the ISDN connection will be that at the beginning of the business day, the
phones will be brought out of Call Suspend mode bringing up the ISDN connection when the first user
either goes off-hook or an incoming call arrives. The ISDN connection will remain up for the remainder of
the business day because all phones will not be idle longer than the Call Suspend timeout value. At the
end of the day, all phones will become inactive for the Call Suspend timeout value and the ISDN
connection will be brought down. If anyone is working late or comes in early, normal usage will bring
back up the ISDN connection.
Reconnection Failures
If the remote attempts to reconnect and fails, all the phones are brought back to "Suspended ...." State
and the connection will be retrieved at the next "Off-hook".
Rebooting the Remote or the Gateway
When the remote and Gateway go into Call Suspend mode, they each keep track of the connection
information, e.g. phone number, call identifier, so that the units can be reconnected when Call Suspend
mode is exited. If any unit reboots while in Call Suspend mode, it will attempt to reconnect after starting.
Note: the TA's can take a while to sync up with the Central office, so connection is not attempted
immediately.
Gateway
There is a problem when the gateway reboots because the remote unit has no way of knowing that the
gateway has lost synchronization. Until the two units re-synchronize, all incoming calls will be ignored. To
resolve this issue, the gateway unit will attempt to re-connect to the remote unit a configurable number of
times (assumes the network link and the remote unit are still functioning). If the connection cannot be
made, it is up to a user at the remote to cause the connection to be made.
Dynamic Reconfiguration
Changing voice parameters at the gateway which need to be sent to the remote, will cause the ISDN
connection to be reestablished. Changing Call Suspend parameters at the remote will take effect
immediately.
PBXgateway II System Administrator's Guide
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