openser(8) on Linux
The text 6719d31e6003, as Debian 5.0 (Lenny) shipped it. The page shows this text now.
flexible and roboust SIP (RFC3261, RFC3263) server for Voice over IP (VoIP)
Flags it lists
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-C -
-D -
-E -
-R -
-T -
-V -
-c -
-d -
-h -
-r -
-v