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--- b2f:start [2025/02/15 10:13] – [Standard Forwarding protocol (MBL/RLI)] f4hof
+++ b2f:start [2026/04/16 05:32] (current) – [Winlink specifics] f4hof
@@ Line 83: / Line 83: @@
 ===== Winlink specifics =====
-Apparently, clients and servers add the feature ''W'' in their SID string when establishing a WL2K connection. Some even complain if the remote peer doesn't expose it. The precise meaning and purpose of that flag is undocumented.
+From my observations, flag ''W'' is exposed by a CMS, or an RMS Relay in its SID string. Winlink clients actively check presence of this flag to confirm they're discussing with the Winlink network.
-W0RLI also ties the features ''T'' and ''U'' in their specification, but without any details on their real meaning.
+Flag ''J'' is exposed by Central Messaging Servers. TODO: analyze an offline RMS Relay transaction to confirm presence of flag ''J'' when establishing a connection, in store and forward and Hybrid network operation scenarii.
+W0RLI also documents ''T'' and ''U'' flags in their specification, but without any details on their real meaning, and those are *NOT* observed in transactions.
 ==== Forward messages ====