dded notes about session timer support in apps

doc/Readme.webconference.txt

@@ -30,6 +30,9 @@ will save its results to a log file.
 A master password can be set, which serves to retrieve room PINs (adminpins),
 for site administrator or the like.
 
+There is SIP Session Timer (RFC4028) support, which is configured in 
+webconference.conf. By default, session timers are turned not enabled.
+
 Room adminpin handling
 ----------------------
 The adminpin is used so that only authorized users can access the conference control.

doc/dsm/Readme.dsm.txt

@@ -58,6 +58,9 @@ directive. That loads a script from the load path (where the current
 script resides), unless an absolute path is given (e.g. 
 #include "/path/to/script).
 
+There is SIP Session Timer (RFC4028) support, which is configured in 
+dsm.conf. By default, session timers are turned not enabled.
+
 SystemDSMs
 ==========