diff --git a/html5/verto/js/src/jquery.FSRTC.js b/html5/verto/js/src/jquery.FSRTC.js
index b2ff3a9ca4..95774e3bf2 100644
--- a/html5/verto/js/src/jquery.FSRTC.js
+++ b/html5/verto/js/src/jquery.FSRTC.js
@@ -119,7 +119,7 @@
 
 	    if (this.options.useVideo) {
 		console.error(this.options.useVideo);
-		this.constraints.manditory.OfferToReceiveVideo = true;
+		this.constraints.mandatory.OfferToReceiveVideo = true;
 	    }
             
 	}
diff --git a/html5/verto/video_demo/js/verto-min.js b/html5/verto/video_demo/js/verto-min.js
index 3577858fb9..76a9b176c9 100644
--- a/html5/verto/video_demo/js/verto-min.js
+++ b/html5/verto/video_demo/js/verto-min.js
@@ -6,7 +6,7 @@ function getCodecPayloadType(sdpLine){var pattern=new RegExp('a=rtpmap:(\\d+) \\
 function setDefaultCodec(mLine,payload){var elements=mLine.split(' ');var newLine=[];var index=0;for(var i=0;i<elements.length;i++){if(index===3){newLine[index++]=payload;}
 if(elements[i]!==payload)newLine[index++]=elements[i];}
 return newLine.join(' ');}
-$.FSRTC=function(options){this.options=$.extend({useVideo:null,useStereo:false,userData:null,localVideo:null,screenShare:false,useCamera:"any",iceServers:false,videoParams:{},audioParams:{},callbacks:{onICEComplete:function(){},onICE:function(){},onOfferSDP:function(){}},},options);this.enabled=true;this.mediaData={SDP:null,profile:{},candidateList:[]};if(moz){this.constraints={offerToReceiveAudio:true};if(this.options.useVideo){this.constraints.offerToReceiveVideo=true;}}else{this.constraints={optional:[{'DtlsSrtpKeyAgreement':'true'}],mandatory:{OfferToReceiveAudio:true}};if(this.options.useVideo){console.error(this.options.useVideo);this.constraints.manditory.OfferToReceiveVideo=true;}}
+$.FSRTC=function(options){this.options=$.extend({useVideo:null,useStereo:false,userData:null,localVideo:null,screenShare:false,useCamera:"any",iceServers:false,videoParams:{},audioParams:{},callbacks:{onICEComplete:function(){},onICE:function(){},onOfferSDP:function(){}},},options);this.enabled=true;this.mediaData={SDP:null,profile:{},candidateList:[]};if(moz){this.constraints={offerToReceiveAudio:true};if(this.options.useVideo){this.constraints.offerToReceiveVideo=true;}}else{this.constraints={optional:[{'DtlsSrtpKeyAgreement':'true'}],mandatory:{OfferToReceiveAudio:true}};if(this.options.useVideo){console.error(this.options.useVideo);this.constraints.mandatory.OfferToReceiveVideo=true;}}
 if(self.options.useVideo){self.options.useVideo.style.display='none';}
 setCompat();checkCompat();};$.FSRTC.validRes=[];$.FSRTC.prototype.useVideo=function(obj,local){var self=this;if(obj){self.options.useVideo=obj;self.options.localVideo=local;if(moz){self.constraints.offerToReceiveVideo=true;}else{self.constraints.mandatory.OfferToReceiveVideo=true;}}else{self.options.useVideo=null;self.options.localVideo=null;if(moz){delete self.constraints.offerToReceiveVideo;}else{delete self.constraints.mandatory.OfferToReceiveVideo;}}
 if(self.options.useVideo){self.options.useVideo.style.display='none';}};$.FSRTC.prototype.useStereo=function(on){var self=this;self.options.useStereo=on;};$.FSRTC.prototype.stereoHack=function(sdp){var self=this;if(!self.options.useStereo){return sdp;}