Nortel Meridian Meridian 1 Feature Description And Administration page 1395

Figure 125
A scenario involving two SAT-Routes where VSIG = YES and SIGO is set to STD
Figure 126
A scenario involving two SAT-Routes where VSIG = YES and SIGO is set to STD
Operating parameters
Network Signaling on Virtual Network Services
Referring to Figure 126, if NSIG is not configured on the bearer side, the
Satellite information is not sent over the bearer. A call from Node 1 to Node 3
passes even if there is a second Satellite Route involved in the call. At Node 3,
the only Satellite information received is that which is received over the VNS
D-Channel.
This feature does not support Call-Back Queuing.
When the NSIG on VNS feature is disabled, the previous functionality exists.
In this case, no signaling digits are sent over the VNS D-Channel. However,
if configured, NSIG is transported over the bearer.
A non-symmetric configuration is supported for bearer trunks.
The VNS D-Channel only supports the NSIG ESN5-protocol. It does not
support EN19 and ETN protocols.
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