diff --git a/src/gov/nist/core/LexerCore.java b/src/gov/nist/core/LexerCore.java
index 81b61f197..86d99f7d0 100755
--- a/src/gov/nist/core/LexerCore.java
+++ b/src/gov/nist/core/LexerCore.java
@@ -479,6 +479,56 @@ public String ttokenSafe() {
             return null;
         }
     }
+    
+    public String ttokenGenValue() {
+        int startIdx = ptr;
+        try {
+            while (hasMoreChars()) {
+                char nextChar = lookAhead(0);
+                if (isAlphaDigit(nextChar)) {
+                    consume(1);
+                }
+                else {
+                    boolean isValidChar = false;
+                    switch (nextChar) {
+                        case '_':
+                        case '+':
+                        case '-':
+                        case '!':
+                        case '`':
+                        case '\'':
+                        case '.':
+                        case '/':
+                        case '}':
+                        case '{':
+                        case ']':
+                        case '[':
+                        case '^':
+                        case '|':
+                        case '~':
+                        case '%': // bug fix by Bruno Konik, JvB copied here
+                        case '#':
+                        case '@':
+                        case '$':
+                        case ':':
+                        case '?':
+                        case '\"':
+                        case '*':
+                            isValidChar = true;
+                    }
+                    if (isValidChar) {
+                        consume(1);
+                    }
+                    else {
+                        break;
+                    }
+                }
+            }
+            return String.valueOf(buffer, startIdx, ptr - startIdx);
+        } catch (ParseException ex) {
+            return null;
+        }
+    }
 
     static final char ALPHA_VALID_CHARS = Character.MAX_VALUE;
     static final char DIGIT_VALID_CHARS = Character.MAX_VALUE - 1;
diff --git a/src/gov/nist/javax/sip/parser/ims/PAccessNetworkInfoParser.java b/src/gov/nist/javax/sip/parser/ims/PAccessNetworkInfoParser.java
index 7c1c6d94c..db478ab1b 100644
--- a/src/gov/nist/javax/sip/parser/ims/PAccessNetworkInfoParser.java
+++ b/src/gov/nist/javax/sip/parser/ims/PAccessNetworkInfoParser.java
@@ -49,7 +49,7 @@
  * <p>RFC 3455 - Private Header (P-Header) Extensions to the Session Initiation
  *   Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP) </p>
  *
- * <p>Sintax (RFC 3455):</p>
+ * <p>Syntax (RFC 3455):</p>
  * <pre>
  * P-Access-Network-Info  = "P-Access-Network-Info" HCOLON access-net-spec
  * access-net-spec        = access-type *(SEMI access-info)
@@ -60,7 +60,23 @@
  * extension-access-info  = gen-value
  * cgi-3gpp               = "cgi-3gpp" EQUAL (token / quoted-string)
  * utran-cell-id-3gpp     = "utran-cell-id-3gpp" EQUAL (token / quoted-string)
+ * gen-value              = token / host / quoted-string
  * </pre>
+ * 
+ * <p>RFC 7913 - P-Access-Network-Info ABNF Update </p>
+ * <p>Newer RFC https://tools.ietf.org/html/rfc7913</p>
+ * <pre>
+ *       access-info            = cgi-3gpp / utran-cell-id-3gpp /
+ *                                dsl-location / i-wlan-node-id /
+ *                                ci-3gpp2 / eth-location /
+ *                                ci-3gpp2-femto / fiber-location /
+ *                                np / gstn-location /local-time-zone /
+ *                                dvb-rcs2-node-id / operator-specific-GI /
+ *                                utran-sai-3gpp / extension-access-info
+ *       np                     = "network-provided"
+ *       extension-access-info  = generic-param
+ * </pre>
+ * 
  *
  * @author Miguel Freitas (IT) PT-Inovacao
  */
@@ -104,8 +120,21 @@ public SIPHeader parse() throws ParseException
                 this.lexer.match(';');
                 this.lexer.SPorHT();
 
-                NameValue nv = super.nameValue('=');
-                accessNetworkInfo.setParameter(nv);
+                try {
+                	NameValue nv = super.nameValue('=');
+                	accessNetworkInfo.setParameter(nv);
+                } catch (ParseException e) {
+                	this.lexer.SPorHT();
+                	String ext = this.lexer.quotedString();
+                	if(ext == null) {
+                		ext = this.lexer.ttokenGenValue();
+                	} else {
+                		// avoids tokens such as "a=b" to be stripped of quotes and misinterpretend as
+                		// RFC 7913 generic-param when re-encoded
+                		ext = "\"" + ext + "\""; 
+                	}
+                	accessNetworkInfo.setExtensionAccessInfo(ext);
+                }
                 this.lexer.SPorHT();
             }
             this.lexer.SPorHT();
diff --git a/src/test/unit/gov/nist/javax/sip/parser/ims/PAccessNetworkInfoParserTest.java b/src/test/unit/gov/nist/javax/sip/parser/ims/PAccessNetworkInfoParserTest.java
index df19323cc..1fdd5dfbf 100644
--- a/src/test/unit/gov/nist/javax/sip/parser/ims/PAccessNetworkInfoParserTest.java
+++ b/src/test/unit/gov/nist/javax/sip/parser/ims/PAccessNetworkInfoParserTest.java
@@ -34,8 +34,15 @@ public void testParser() {
 
         String[] accessNetworkInfo =  {
 
+        		"P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE; [123:4::abcd]; rand=l\n",
+        		"P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE; a-b.c1; rand=l\n",
+        		"P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE; 127.0.0.1; rand=l\n",
+        		"P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE;\"\"\n",
+        		"P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE;\";\"\n",
+        		"P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE;\"ip=123.123.123.123\"\n",
+        		"P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE; [123:4::abcd];rand=l\n",
+        		"P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE; [123:4::abcd]\n",
                 "P-Access-Network-Info: IEEE-802.11\n",
-
                 "P-Access-Network-Info: 3GPP-UTRAN-TDD; utran-cell-id-3gpp=23456789ABCDE\n"
 
         };