Nortel Meridian Meridian 1 Feature Description And Administration page 1194

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553-2901-301 Standard 9.00 January 2002
MCDN Alternate Routing
At node B, the SBOC option is checked to determine the routing treatment:
• If node B is defined as SBOC = NRR, no rerouting occurs; the Call
Clearing message is sent back to the preceding node, A.
• If node B is defined as SBOC = RRO, the Call Clearing message is sent
back to the preceding node, A, because node B is not the originating
node.
• If node B is defined as SBOC = RRA, an attempt is made to find an
available alternate route until all of the alternate routes, as defined by
Route List (the RLB prompt in LD 86) are tried.
Figure 95 illustrates a transit node operation with node B defined as
SBOC = RRA. The first available alternate route is found between nodes B
and E. Node E can either be a Private Exchange or Central Office. The
Network Class of Service access checks are passed, the direct leg between the
congested node (node D) is released, and an alternate route is created from
node B through node E to the terminating node, D.