Nortel Media Gateway 3200 User Manual page 89

H.248 User's Manual
7.2.2.4 Authorization Check of Call Manager IP Addresses
While the H.248 specification specifies that only one Call Manager can send commands to
the gateway at a time, MG 3200 gateways handle the Authorization
Check in either of these modes:
1. No authorization check is performed. This mode specifies that every command is
accepted and executed.
2. The IP address of the Call Manager sending the incoming command is checked
against the list of provisioned Call Managers. If it matches one on the list, the
command is executed. If The Call Manager' IP Address is not found on the list, an
error message is sent. This mode is set as the default.
These two modes are controlled by the ini file parameter 'MEGACOCheckLegalityOfMGC',
for which the default value is 1.
7.2.2.5 Support of DiffServ Capabilities
The DiffServ value of the IP header can be set for both the control path and the media
path. The range of the DiffServ parameter is between 0 and 63. It enables routers to
differentiate between different streams. The values are set via SNMP, Web or ini file
parameter. Note, that changing the value of the control path requires the Gateway to be
reset.
The value of the control path is set via the ini file parameter 'ControlDIFFSERV', and the
value for the media path is set via the ini file parameter 'IPDIFFSERV'.
7.2.2.6 Handling Events
Events are declared in an EventsDescriptor that has an ID and a list of events on which the
Call Agent requires notification. Up to 16 events can be defined in the descriptor. Wildcards
are permitted in the events names. For example, if the list includes dd/*, and the user
presses the number 1, the Call Agent receives notification when the digit starts
(dd/std{tl=d1}) and when it ends (dd/etd{tl=d1}). The event dd/d1 is not sent, as it is
included in the other two. An event can have parameters, for example, the KeepActive flag.
When the event having the KeepActive flag is received, it does not stop the currently
played signals.
An event can have an embedded descriptor in it. It can be a SignalsDescriptor (refer to
"Playing Signals" below), a new EventDescriptor, or both. The embedded descriptor
replaces the current descriptor.
7.2.2.7 Playing Signals
Signals in H.248 reside in a SignalsDescriptor. Only one signal is allowed in the descriptor
as the MG 3200s cannot play more than one signal at a time. However, this one signal can
be of the SignalList type. In which case, there can be up to 30 signals in the list, and they
are played sequentially until the list ends or the execution is interrupted.
Version SN09 89
7. Standard Control Protocols
October 2006