diff --git a/src/Grammar/dist/Grammar.js b/src/Grammar/dist/Grammar.js
index 4c3289fb1..af3a14039 100644
--- a/src/Grammar/dist/Grammar.js
+++ b/src/Grammar/dist/Grammar.js
@@ -6278,11 +6278,14 @@ JsSIP.Grammar = (function(){
         }
         if (result0 !== null) {
           result0 = (function(offset, hname, hvalue) {
-                              hname = hname.join('');
+                              hname = hname.join('').toLowerCase();
                               hvalue = hvalue.join('');
                               if(!data.uri_headers) data.uri_headers = {};
-                              data.uri_headers[hname] = hvalue;
-                              })(pos0, result0[0], result0[2]);
+                              if (!data.uri_headers[hname]) {
+                                data.uri_headers[hname] = [hvalue];
+                              } else {
+                                data.uri_headers[hname].push(hvalue);
+                              }})(pos0, result0[0], result0[2]);
         }
         if (result0 === null) {
           pos = pos0;
diff --git a/src/Grammar/dist/Grammar.min.js b/src/Grammar/dist/Grammar.min.js
index dd89beb1d..e10b2b33c 100644
--- a/src/Grammar/dist/Grammar.min.js
+++ b/src/Grammar/dist/Grammar.min.js
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+d;)c.push(d),g=b,d=u(),null!==d?(e=sa(),null!==e?d=[d,e]:(d=null,b=g)):(d=null,b=g);null!==c?a=[a,c]:(a=null,b=f)}else a=null,b=f;return a},route_param:sa,Subscription_State:function(){var a,c,d,e,f,g;f=b;a=xc();if(null!==a){c=[];g=b;d=v();null!==d?(e=Va(),null!==e?d=[d,e]:(d=null,b=g)):(d=null,b=g);for(;null!==d;)c.push(d),g=b,d=v(),null!==d?(e=Va(),null!==e?d=[d,e]:(d=null,b=g)):(d=null,b=g);null!==c?a=[a,c]:(a=null,b=f)}else a=null,b=f;return a},substate_value:xc,subexp_params:Va,event_reason_value:yc,
+Subject:function(){var a;a=eb();return null!==a?a:""},Supported:function(){var a,c,d,e,f,g;f=b;a=r();if(null!==a){c=[];g=b;d=u();null!==d?(e=r(),null!==e?d=[d,e]:(d=null,b=g)):(d=null,b=g);for(;null!==d;)c.push(d),g=b,d=u(),null!==d?(e=r(),null!==e?d=[d,e]:(d=null,b=g)):(d=null,b=g);null!==c?a=[a,c]:(a=null,b=f)}else a=null,b=f;return null!==a?a:""},To:function(){var a,c,d,e,f,g,l;g=f=b;a=ea();null===a&&(a=M());if(null!==a){c=[];l=b;d=v();null!==d?(e=Wa(),null!==e?d=[d,e]:(d=null,b=l)):(d=null,b=
+l);for(;null!==d;)c.push(d),l=b,d=v(),null!==d?(e=Wa(),null!==e?d=[d,e]:(d=null,b=l)):(d=null,b=l);null!==c?a=[a,c]:(a=null,b=g)}else a=null,b=g;if(null!==a){a=j.tag;try{j=new JsSIP.NameAddrHeader(j.uri,j.display_name,j.params),a&&j.setParam("tag",a)}catch(o){j=-1}a=void 0}null===a&&(b=f);return a},to_param:Wa,Via:function(){var a,c,d,e,f,g;f=b;a=ta();if(null!==a){c=[];g=b;d=u();null!==d?(e=ta(),null!==e?d=[d,e]:(d=null,b=g)):(d=null,b=g);for(;null!==d;)c.push(d),g=b,d=u(),null!==d?(e=ta(),null!==
+e?d=[d,e]:(d=null,b=g)):(d=null,b=g);null!==c?a=[a,c]:(a=null,b=f)}else a=null,b=f;return a},via_parm:ta,via_params:Xa,via_ttl:Bc,via_maddr:Cc,via_received:Dc,via_branch:Ec,response_port:Fc,sent_protocol:zc,protocol_name:Gc,transport:ua,sent_by:Ac,via_host:Hc,via_port:Ic,ttl:La,WWW_Authenticate:function(){return Ua()},extension_header:function(){var a,c,d,e;e=b;a=r();null!==a?(c=db(),null!==c?(d=Jc(),null!==d?a=[a,c,d]:(a=null,b=e)):(a=null,b=e)):(a=null,b=e);return a},header_value:Jc,message_body:function(){var a,
+b;a=[];for(b=wa();null!==b;)a.push(b),b=wa();return a},stun_URI:function(){var a,c,d,h;h=b;a=Kc();null!==a?(58===e.charCodeAt(b)?(c=":",b++):(c=null,0===f&&g('":"')),null!==c)?(d=Ya(),null!==d?a=[a,c,d]:(a=null,b=h)):(a=null,b=h):(a=null,b=h);return a},stun_scheme:Kc,stun_host_port:Ya,stun_host:Lc,reg_name:Z,stun_unreserved:Za,sub_delims:$a,turn_URI:function(){var a,c,d,h,i,j,l;j=b;a=Mc();null!==a?(58===e.charCodeAt(b)?(c=":",b++):(c=null,0===f&&g('":"')),null!==c)?(d=Ya(),null!==d)?(l=b,"?transport="===
+e.substr(b,11)?(h="?transport=",b+=11):(h=null,0===f&&g('"?transport="')),null!==h?(i=ua(),null!==i?h=[h,i]:(h=null,b=l)):(h=null,b=l),h=null!==h?h:"",null!==h)?a=[a,c,d,h]:(a=null,b=j):(a=null,b=j):(a=null,b=j):(a=null,b=j);return a},turn_scheme:Mc,turn_transport:function(){var a,c,d,h,i;i=h=b;a=ua();if(null!==a){"udp"===e.substr(b,3).toLowerCase()?(c=e.substr(b,3),b+=3):(c=null,0===f&&g('"udp"'));if(null===c&&("tcp"===e.substr(b,3).toLowerCase()?(c=e.substr(b,3),b+=3):(c=null,0===f&&g('"tcp"')),
+null===c)){c=[];for(d=w();null!==d;)c.push(d),d=w()}null!==c?a=[a,c]:(a=null,b=i)}else a=null,b=i;null!==a&&(j.transport=transport,a=void 0);null===a&&(b=h);return a}};if(void 0!==C){if(void 0===Nc[C])throw Error("Invalid rule name: "+bb(C)+".");}else C="CRLF";var b=0,f=0,O=0,va=[],j={};if(null===Nc[C]()||b!==e.length){var ab=Math.max(b,O),Rc=ab<e.length?e.charAt(ab):null,Oc=Qc();new this.SyntaxError(Pc(va),Rc,ab,Oc.line,Oc.column);return-1}return j},toSource:function(){return this._source},SyntaxError:function(e,
+C,g,J,p){this.name="SyntaxError";this.expected=e;this.found=C;switch(e.length){case 0:e="end of input";break;case 1:e=e[0];break;default:e=e.slice(0,e.length-1).join(", ")+" or "+e[e.length-1]}C=C?bb(C):"end of input";this.message="Expected "+e+" but "+C+" found.";this.offset=g;this.line=J;this.column=p}};J.SyntaxError.prototype=Error.prototype;return J}();
diff --git a/src/Grammar/src/Grammar.pegjs b/src/Grammar/src/Grammar.pegjs
index 499601bd8..abae07fbd 100644
--- a/src/Grammar/src/Grammar.pegjs
+++ b/src/Grammar/src/Grammar.pegjs
@@ -254,11 +254,14 @@ param_unreserved  = "[" / "]" / "/" / ":" / "&" / "+" / "$"
 headers           = "?" header ( "&" header )*
 
 header            = hname: hname "=" hvalue: hvalue  {
-                      hname = hname.join('');
+                      hname = hname.join('').toLowerCase();
                       hvalue = hvalue.join('');
                       if(!data.uri_headers) data.uri_headers = {};
-                      data.uri_headers[hname] = hvalue;
-                      }
+                      if (!data.uri_headers[hname]) {
+                        data.uri_headers[hname] = [hvalue];
+                      } else {
+                        data.uri_headers[hname].push(hvalue);
+                      }}
 
 hname             = ( hnv_unreserved / unreserved / escaped )+