ejabberd: document more compat & how to admin

hosts/by-name/servo/services/ejabberd.nix

@@ -14,15 +14,25 @@
 #
 # compliance tests:
 # - <https://compliance.conversations.im/server/uninsane.org/#xep0352>
-{ config, lib, pkgs, ... }:
-
+#
+# administration:
+# - `sudo -u ejabberd ejabberdctl help`
+#
 # federation/support matrix:
 # - avatars
 #   - nixnet.services + dino: works in MUCs but not DMs  (as of 2023 H1)
 #   - movim.eu + dino: works in DMs, MUCs untested  (as of 2023/08/29)
 # - calls
 #   - local + dino: audio, video, works in DMs  (as of 2023/08/29)
-#   - movim.eu + dino: audio, video, works in DMs, no matter which side initiated  (as of 2023/08/30)
+#   - movim.eu + dino: audio, video, works in DMs, no matter which side initiates  (as of 2023/08/30)
+#   - +native-cell-number@cheogram.com + dino: audio works in DMs, no matter which side initiates  (as of 2023/09/01)
+#     - can receive calls even if sender isn't in my roster
+#     - this is presumably using JMP.chat's SIP servers, which then convert it to XMPP call
+#
+# bugs:
+# - 2023/09/01: will randomly stop federating. `systemctl restart ejabberd` fixes, but takes 10 minutes.
+{ config, lib, pkgs, ... }:
+
 let
   # TODO: this range could be larger, but right now that's costly because each element is its own UPnP forward
   # TURN port range (inclusive)