Nortel Meridian Meridian 1 Feature Description And Administration page 918

Page 918 of 1814
553-2901-301 Standard 9.00 January 2002
ISDN QSIG
Trunk Route Optimization
Trunk Route Optimization (TRO) is supported within the Meridian 1 network
only. When a redirecting node sends a message to the originating node and
the TRO request is accepted, the new call can go through the QSIG interface
as a normal basic call. However, TRO signaling will not be able to operate on
the QSIG interface.
Network Call Redirection
The existing Network Call Redirection limitation on unsupported interfaces
applies to the QSIG interface. When a call is terminated on the Meridian 1 and
network call redirection is active, the feature can still be operated but the
Original Called number and the Redirection number Information Elements
(IEs) which are used by the Network Call Redirection feature will not be sent
on by the QSIG interface.
ISDN Signaling Link (ISL)
The existing ISL operation is supported on the QSIG interface on the
PRI/PRI2 interface only.
Network Attendant Service (NAS)
The interaction with NAS is as though the call is going to a route without
NAS equipped. The only information exchanged between NAS and the QSIG
interface is the transit count. Other information contained in the Progress IE
will be handled by a future development.
Call Forward, Break-In and Hunt Internal or External Network
Wide
Call Forward, Break-In and Hunt Internal or External Network Wide uses the
Network Attendant Service equivalent information that is transported on
protocols such as Party Category and Progress Indicator for QSIG.
Virtual Network Services (VNS)
VNS provides ISDN features when no MCDN link is available between two
switches. This can be done when analog lines are available or when ISDN
links that provide no supplementary services are used. The existing link is
used as a B-channel, and a separate D-channel handles the MCDN signaling
between the two end switches.