Nortel Networks 9150 - Manual (Page 66)

36 Remote Gateway 9150 Installation and Administration Guide
Remote Gateway 9150 description Standard 3.1
Station priority
You can define the priority of a station’s assigned RLC port as normal, high, IP
only, or circuit only.
Normal priority
When both the IP and PSTN networks are used to route calls, calls to and from
the station are routed primarily over the IP network. Calls transition between the
IP and PSTN networks whenever voice QoS levels change. (The voice QoS
levels are defined on the Quality of Service screen on the RLC for your Remote
Gateway 9150 unit.)
High priority
When you define an RLC port as high priority, the associated station has the
following benefits:
!
If allowed to use the IP network to process calls (this is transparent to the
user), an active call on that station is always one of the first to transition to
PSTN trunks when Voice over IP QoS degrades. (This transition is
accomplished using the QoS Transitioning Technology.)
!
Call blocking is reduced because bandwidth is always available to these
stations.
Note: If the reserved bandwidth is being used by other high priority
stations, then new calls are processed using unreserved bandwidth.
The number of stations that you can configure as high priority depends on the
amount of available bandwidth. Ensure that enough bandwidth is available to
process calls on normal priority stations.
IP only
Calls to and from the station are routed over the IP network only. QoS
transitioning is not available for stations that are defined as IP only.
Circuit only
Calls to and from the station are routed over the PSTN network only. Circuit
only stations never experience voice QoS degradation.