Nortel Remote Gateway 9110 Installation And Administration Manual page 77

June 2005
Models 1 and 2 - IP only
All inbound calls to PSTN line appear on local keys.
Model 3 - PSTN permanent
Inbound PSTN calls ring the local calling key when the Remote Gateway
911x series unit is offline.
Inbound PSTN callers hear a busy signal when the Remote Gateway 911x
series unit is online.
Model 4 - PSTN on-demand
Inbound PSTN calls ring the local calling key when the Remote Gateway
911x series unit is offline.
Inbound PSTN callers hear a busy signal when the Remote Gateway 911x
series unit is online and the PSTN link is available.
The modem answers inbound PSTN calls the when Remote Gateway 911x
series unit is online and the PSTN link is unavailable.
Note: Nortel does not recommend the Model 4 configuration due to the delays
in establishing bandwidth. In addition, a PSTN caller can hear a burst of modem
tones if calling the analog line when it is idle in the online mode.
Model 5 - IP permanent/PSTN permanent
Inbound PSTN calls ring the local calling key when IP QoS is good.
Inbound PSTN callers receive a busy signal when IP QoS is bad and the
PSTN modem link is up
The Remote Gateway 911x series unit always initiates QoS Transition. This
allows the Remote Gateway 911x series unit to treat incoming PSTN calls
as local calls when TCP/IP is available.
If TCP/IP is unavailable, the Remote Gateway 911x series unit answers
incoming PSTN calls with the modem.
Remote Gateway 911x Series Installation and Administration Guide
Planning for installation
53