MT#65570 document new ICE options

Change-Id: Ie09ed9fdb86ad18d5b15a79441eaad1955ea05ba

README.md

@@ -37,11 +37,13 @@ the following additional features are available:
 
 - Full SDP parsing and rewriting
 - Supports non-standard RTCP ports (RFC 3605)
-- ICE (RFC 5245) support:
+- ICE (RFC 8445) support:
   + Bridging between ICE-enabled and ICE-unaware user agents
   + Optionally acting only as additional ICE relay/candidate
   + Optionally forcing relay of media streams by removing other ICE candidates
   + Optionally act as an "ICE lite" peer only
+  + Optional trickle ICE support (RFC 8838)
+  + Optional ICE2 support
 - SRTP (RFC 3711) support:
   + Support for SDES (RFC 4568) and DTLS-SRTP (RFC 5764)
   + AES-CM and AES-F8 ciphers, both in userspace and in kernel

docs/ng_control_protocol.md

@@ -442,7 +442,8 @@ Optionally included keys are:
 
 * `ICE`
 
-	Contains a string which must be one of the following values:
+    Contains a list of strings, or alternatively a single string, each of which
+    must be one of the following values:
 
 	With `remove`, any ICE attributes are stripped from the SDP body. Also
 	see the flag `reject ICE` to effect an early removal of ICE support
@@ -464,8 +465,18 @@ Optionally included keys are:
 	low-priority candidate. This used to be the default behaviour in previous versions of
 	*rtpengine*.
 
+    Adding `trickle` to the list of strings is identical to using the `trickle
+    ICE` flag described below.
+
 	The default behaviour (no `ICE` key present at all) is the same as `default`.
 
+    To influence behaviour related to ICE-lite, flags can be included in this
+    list here instead of using the separate `ICE-lite=` option. For example,
+    instead of using `ICE-lite=both`, the flag `lite-both` can be included in
+    this list.
+
+    Adding `ice2` to the list will advertise support for ICE2 in an outgoing offer.
+
 	This flag operates independently of the `replace` flags.
 
 	Note that if config parameter `save-interface-ports = true`, ICE will be broken, because