Index: lams_admin/conf/language/lams/ApplicationResources_en_AU.properties
===================================================================
diff -u -r298b5600c99cf71c588d5ae57c48a1c66500e3b5 -r63bee30ea13fab1267c0744f26929af1736a1cf9
--- lams_admin/conf/language/lams/ApplicationResources_en_AU.properties	(.../ApplicationResources_en_AU.properties)	(revision 298b5600c99cf71c588d5ae57c48a1c66500e3b5)
+++ lams_admin/conf/language/lams/ApplicationResources_en_AU.properties	(.../ApplicationResources_en_AU.properties)	(revision 63bee30ea13fab1267c0744f26929af1736a1cf9)
@@ -634,5 +634,6 @@
 outcome.authoring.existing.none  =none
 sysadmin.maintain.session.name  =Name
 
+sysadmin.alternative.user.id.name  =Use alternative parameter name "lis_person_sourcedid" to get user id
 
 #======= End labels: Exported 627 labels for en AU =====
Index: lams_admin/src/java/org/lamsfoundation/lams/admin/web/form/LtiConsumerForm.java
===================================================================
diff -u -rb77e07f34f5d86b1f69b0d10c08ed78b6acdb955 -r63bee30ea13fab1267c0744f26929af1736a1cf9
--- lams_admin/src/java/org/lamsfoundation/lams/admin/web/form/LtiConsumerForm.java	(.../LtiConsumerForm.java)	(revision b77e07f34f5d86b1f69b0d10c08ed78b6acdb955)
+++ lams_admin/src/java/org/lamsfoundation/lams/admin/web/form/LtiConsumerForm.java	(.../LtiConsumerForm.java)	(revision 63bee30ea13fab1267c0744f26929af1736a1cf9)
@@ -30,6 +30,8 @@
 public class LtiConsumerForm extends ExtServerCommonForm {
 
     private String ltiToolConsumerMonitorRoles;
+    
+    private Boolean useAlternativeUseridParameterName;
 
     public String getLtiToolConsumerMonitorRoles() {
 	return ltiToolConsumerMonitorRoles;
@@ -38,5 +40,13 @@
     public void setLtiToolConsumerMonitorRoles(String ltiToolConsumerMonitorRoles) {
 	this.ltiToolConsumerMonitorRoles = ltiToolConsumerMonitorRoles;
     }
+    
+    public Boolean isUseAlternativeUseridParameterName() {
+	return useAlternativeUseridParameterName;
+    }
 
+    public void setUseAlternativeUseridParameterName(Boolean useAlternativeUseridParameterName) {
+	this.useAlternativeUseridParameterName = useAlternativeUseridParameterName;
+    }
+
 }
Index: lams_admin/web/integration/ltiConsumer.jsp
===================================================================
diff -u -rccc788f07597ad3fde52adb6ff13e964b552c35d -r63bee30ea13fab1267c0744f26929af1736a1cf9
--- lams_admin/web/integration/ltiConsumer.jsp	(.../ltiConsumer.jsp)	(revision ccc788f07597ad3fde52adb6ff13e964b552c35d)
+++ lams_admin/web/integration/ltiConsumer.jsp	(.../ltiConsumer.jsp)	(revision 63bee30ea13fab1267c0744f26929af1736a1cf9)
@@ -92,7 +92,6 @@
 						<form:input path="prefix" size="10" cssClass="form-control"/>
 					</td>
 				</tr>
-						
 				<tr>
 					<td><fmt:message key="sysadmin.disabled" />:</td>
 					<td>
@@ -111,6 +110,12 @@
 						<form:input path="ltiToolConsumerMonitorRoles" size="30"/>
 					</td>
 				</tr>
+				<tr>
+					<td><fmt:message key="sysadmin.alternative.user.id.name" />:</td>
+					<td>
+						<form:checkbox path="useAlternativeUseridParameterName" />
+					</td>
+				</tr>
 			</table>
 				
 			<%@ include file="extLessonForm.jsp"%>
Index: lams_central/src/java/org/lamsfoundation/lams/web/LoginRequestLtiServlet.java
===================================================================
diff -u -rc975a1230b65f2245c5c77ba413afe97a2816df9 -r63bee30ea13fab1267c0744f26929af1736a1cf9
--- lams_central/src/java/org/lamsfoundation/lams/web/LoginRequestLtiServlet.java	(.../LoginRequestLtiServlet.java)	(revision c975a1230b65f2245c5c77ba413afe97a2816df9)
+++ lams_central/src/java/org/lamsfoundation/lams/web/LoginRequestLtiServlet.java	(.../LoginRequestLtiServlet.java)	(revision 63bee30ea13fab1267c0744f26929af1736a1cf9)
@@ -78,8 +78,15 @@
 
     @Override
     public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
-	String extUsername = request.getParameter(BasicLTIConstants.USER_ID);
+	String consumerKey = request.getParameter(LtiUtils.OAUTH_CONSUMER_KEY);
+	ExtServer extServer = integrationService.getExtServer(consumerKey);
+	//get user id as "user_id" parameter, or as lis_person_sourcedid (if according option is ON for this LTI server)
+	String lisPersonSourcedid = request.getParameter(BasicLTIConstants.LIS_PERSON_SOURCEDID);
+	String extUsername = extServer.isUseAlternativeUseridParameterName()
+		&& StringUtils.isNotBlank(lisPersonSourcedid) ? lisPersonSourcedid
+			: request.getParameter(BasicLTIConstants.USER_ID);
 	String roles = request.getParameter(BasicLTIConstants.ROLES);
+	
 	// implicit login params
 	String firstName = request.getParameter(BasicLTIConstants.LIS_PERSON_NAME_GIVEN);
 	String lastName = request.getParameter(BasicLTIConstants.LIS_PERSON_NAME_FAMILY);
@@ -88,8 +95,7 @@
 	String locale = request.getParameter(BasicLTIConstants.LAUNCH_PRESENTATION_LOCALE);
 	String countryIsoCode = LoginRequestLtiServlet.getCountry(locale);
 	String langIsoCode = LoginRequestLtiServlet.getLanguage(locale);
-
-	String consumerKey = request.getParameter(LtiUtils.OAUTH_CONSUMER_KEY);
+	
 	String resourceLinkId = request.getParameter(BasicLTIConstants.RESOURCE_LINK_ID);
 	String contextId = request.getParameter(BasicLTIConstants.CONTEXT_ID);
 	String contextLabel = request.getParameter(BasicLTIConstants.CONTEXT_LABEL);
@@ -100,7 +106,6 @@
 	}
 
 	//verify whether request was correctly signed by OAuth
-	ExtServer extServer = integrationService.getExtServer(consumerKey);
 	String secret = extServer.getServerkey();// retrieve corresponding secret for key from db
 	LtiVerificationResult ltiResult = null;
 	try {
Index: lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch20191009.sql
===================================================================
diff -u
--- lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch20191009.sql	(revision 0)
+++ lams_common/src/java/org/lamsfoundation/lams/dbupdates/patch20191009.sql	(revision 63bee30ea13fab1267c0744f26929af1736a1cf9)
@@ -0,0 +1,14 @@
+-- Turn off autocommit, so nothing is committed if there is an error
+SET AUTOCOMMIT = 0;
+SET FOREIGN_KEY_CHECKS=0;
+----------------------Put all sql statements below here-------------------------
+
+-- LDEV-4876 Ability for LTI servers to get userId from another request parameter name
+ALTER TABLE lams_ext_server_org_map ADD COLUMN `use_alternative_user_id_parameter_name` tinyint(1) DEFAULT '0';
+
+----------------------Put all sql statements above here-------------------------
+
+-- If there were no errors, commit and restore autocommit to on
+COMMIT;
+SET AUTOCOMMIT = 1;
+SET FOREIGN_KEY_CHECKS=1;
\ No newline at end of file
Index: lams_common/src/java/org/lamsfoundation/lams/integration/ExtServer.java
===================================================================
diff -u -r6b58638c62c43fc5b43bc67402d77b347311bc16 -r63bee30ea13fab1267c0744f26929af1736a1cf9
--- lams_common/src/java/org/lamsfoundation/lams/integration/ExtServer.java	(.../ExtServer.java)	(revision 6b58638c62c43fc5b43bc67402d77b347311bc16)
+++ lams_common/src/java/org/lamsfoundation/lams/integration/ExtServer.java	(.../ExtServer.java)	(revision 63bee30ea13fab1267c0744f26929af1736a1cf9)
@@ -115,6 +115,9 @@
      */
     @Column(name = "lti_consumer_monitor_roles")
     private String ltiToolConsumerMonitorRoles;
+    
+    @Column(name = "use_alternative_user_id_parameter_name")
+    private Boolean useAlternativeUseridParameterName;
 
     public ExtServer() {
 	timeToLiveLoginRequest = 80;
@@ -333,4 +336,12 @@
     public void setGradebookOnComplete(Boolean gradebookOnComplete) {
 	this.gradebookOnComplete = gradebookOnComplete;
     }
+    
+    public Boolean isUseAlternativeUseridParameterName() {
+	return useAlternativeUseridParameterName;
+    }
+
+    public void setUseAlternativeUseridParameterName(Boolean useAlternativeUseridParameterName) {
+	this.useAlternativeUseridParameterName = useAlternativeUseridParameterName;
+    }
 }
\ No newline at end of file