====== adv.sdpModify() ======
wrtc.adv.sdpModify() can be used to modify SDP-s sent to remote clients, for instance if you want to add your own entries to it.

wrtc objects does not have any adv.sdpModify() functions by default. Class [[ixnx:wrtc:js:api:wrtcobject|wrtcObject]] declares it as null. You need to **write your own** wrtc.adv.sdpModify() function if you want to use it.

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wrtc.adv.sdpModify() is for advanced users only! Incorrect use may cause webRTC stop functioning correctly.
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===== Arguments =====
wrtc.adv.sdpModify(sdp):
  * string containing SDP generated by webRTC

===== Returns =====
String containing modified SDP.

===== Example =====
wrtc.adv.sdpModify = function(sdp) { return sdp.replace(/v=0\r\n/, "v=0\r\na=foo: bar\r\n") }; makes all SDP-s object wrtc_kit sends to remote clients contain "a=foo: bar" as second line (v=0 is first).