Nortel Meridian Meridian 1 Feature Description And Administration page 1655

DPNSS1/VNS with DPNSS1 node
DPNSS1
• If a congestion is encountered inside the VNS portion of the path, the
VNS portion of the call is cleared and the disconnection is propagated
back to the originating DPNSS1 side. The Step Back on Congestion
feature is invoked, if it is configured.
• If a congestion is encountered the within the DPNSS1 portion of the path,
with the DPNSS1 trunk being used as a VNS Bearer, the VNS portion of
the call is cleared and a normal disconnection is propagated back to the
originating DPNSS1 side. The Step Back on Congestion feature is not
invoked, even if it is configured.
• Refer to "Network Attendant Service (NAS)" on page 1655 for
information on the interaction with NAS in a similar scenario.
DPNSS1 Executive Intrusion
DPNSS1 Extension Three-Party Service is not supported over VNS Bearer
trunks. Attendant Break-in may be provided instead, if NAS is configured
over the VNS Bearer trunks.
Network Attendant Service (NAS)
DPNSS1
• NAS calls being routed over the DPNSS1 network used as VNS Bearer
will get dropped if there is congestion in the bearer call setup. NAS DBK
(drop back) will not occur even if it is configured.
International ISDN PRI Feature description and administration
Virtual Network Services
VNS
DPNSS1
VNS
DPNSS1
Page 1655 of 1814