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The Level 4 Converter can be used for phased migration of STPs, hence, avoiding flash cuts and system isolation as legacy STPs are retired. This method of STP migration has the following advantages:
reconfiguration of SS7 nodes is transparent
Consider the following for this STP migration method:
ISUP, SCCP, and BICC messages are supported by the L4 Converter
the converter is already licensed and deployed for an SS7 protocol conversion
the migration is configured for networks other than ANSI or ITU
For detailed information about the STP migration process, refer to STP Migration Process.
Conflicting registrations for Signaling Indicator (SI) 3 would result and depending on which application registers first on a per slot basis, the traffic would either hit the GTT or the L4 Converter.
It is recommended a new VNode on NA 1 (as seen in the following diagram) is used instead of the conflicting LPC, so traffic from NA 1 can reach NA 2 through the L4 Converter.