openser(8) on Linux
The text 8a8d3726b2ac, as Debian 4.0 (Etch) shipped it.
flexible and roboust SIP (RFC3261, RFC3263) server for Voice over IP (VoIP)
Flags it lists
-
-C -
-D -
-E -
-R -
-T -
-V -
-c -
-d -
-h -
-r -
-v