enable_media_stream_cache setting does not work

[GoogleCodeExporter]

This 
setting(http://sipml5.org/docgen/symbols/SIPml.Stack.Configuration.html#enable_m
edia_stream_cache) does not work over http.

In sipml v1.4.217 it could possible to use this setting after patching 
tsip_dialog_invite.prototype.new_msession_mgr function, like this - change
a.set(tmedia_session_mgr.prototype.SetParamSession(a.e_type, "ice-servers", 
this.get_stack().network.ao_ice_servers), 
tmedia_session_mgr.prototype.SetParamSession(a.e_type, "cache-stream", 
this.get_stack().network.b_cache_stream), 
tmedia_session_mgr.prototype.SetParamSession(a.e_type, "bandwidth", 
this.get_session().media.o_bandwidth), 
tmedia_session_mgr.prototype.SetParamSession(a.e_type, "video-size", 
this.get_session().media.o_video_size));

on

a.set(tmedia_session_mgr.prototype.SetParamSession(a.e_type, "ice-servers", 
this.get_stack().network.ao_ice_servers), 
tmedia_session_mgr.prototype.SetParamSession(a.e_type, "cache-stream", 
this.get_stack().media.b_cache_stream), 
tmedia_session_mgr.prototype.SetParamSession(a.e_type, "bandwidth", 
this.get_session().media.o_bandwidth), 
tmedia_session_mgr.prototype.SetParamSession(a.e_type, "video-size", 
this.get_session().media.o_video_size));

But in sipml5 v 1.5.222 you added handler this.o_pc.onsignalingstatechange, 
which is the reason of "Failed to set local answer sdp: Called in wrong state: 
STATE_SENTACCEPT" error, which I get on incoming call.

If remove this handler everything is work as well. 

Original issue reported on code.google.com by d.sols...@gmail.com on 14 Jan 2015 at 1:09