Index: lams_central/web/lti/addLesson.jsp
===================================================================
diff -u -r8e750a84c26284326f3de2f3f32ea31b4bd9776b -ra2192472523e87d395397d22794e32eb1f4c62a8
--- lams_central/web/lti/addLesson.jsp	(.../addLesson.jsp)	(revision 8e750a84c26284326f3de2f3f32ea31b4bd9776b)
+++ lams_central/web/lti/addLesson.jsp	(.../addLesson.jsp)	(revision a2192472523e87d395397d22794e32eb1f4c62a8)
@@ -174,6 +174,7 @@
     	<input type="hidden" name="resource_link_id" value="${resource_link_id}">
         <input type="hidden" name="courseId" value="${courseId}">
         <input type="hidden" name="context_id" value="${context_id}">
+        <input type="hidden" name="custom_context_memberships_url" value="${custom_context_memberships_url}">
     	<input type="hidden" name="ldId" id="ldId" value="0">
     	
     	<%-- ContentItemSelectionRequest items --%>
Index: lams_common/src/java/org/lamsfoundation/lams/integration/service/IIntegrationService.java
===================================================================
diff -u -rcd53cf4e357dfbd690fb81c14cc0c47c33d3dd29 -ra2192472523e87d395397d22794e32eb1f4c62a8
--- lams_common/src/java/org/lamsfoundation/lams/integration/service/IIntegrationService.java	(.../IIntegrationService.java)	(revision cd53cf4e357dfbd690fb81c14cc0c47c33d3dd29)
+++ lams_common/src/java/org/lamsfoundation/lams/integration/service/IIntegrationService.java	(.../IIntegrationService.java)	(revision a2192472523e87d395397d22794e32eb1f4c62a8)
@@ -242,8 +242,8 @@
      * @param lessonId
      *            if supplied, user will be added to the according lesson; and only to the course otherwise
      */
-    void addUsersUsingMembershipService(ExtServer extServer, Long lessonId, String extCourseId, String resourceLinkId)
-	    throws IOException, UserInfoFetchException, UserInfoValidationException;
+    void addUsersUsingMembershipService(ExtServer extServer, Long lessonId, String extCourseId, String resourceLinkId,
+	    String customContextMembershipUrl) throws IOException, UserInfoFetchException, UserInfoValidationException;
 
     /**
      * Adds an external user to the course with specified courseId.
Index: lams_common/src/java/org/lamsfoundation/lams/integration/service/IntegrationService.java
===================================================================
diff -u -rac4d536a03727d777f942460c2e246ba2940b581 -ra2192472523e87d395397d22794e32eb1f4c62a8
--- lams_common/src/java/org/lamsfoundation/lams/integration/service/IntegrationService.java	(.../IntegrationService.java)	(revision ac4d536a03727d777f942460c2e246ba2940b581)
+++ lams_common/src/java/org/lamsfoundation/lams/integration/service/IntegrationService.java	(.../IntegrationService.java)	(revision a2192472523e87d395397d22794e32eb1f4c62a8)
@@ -973,16 +973,23 @@
 
     @Override
     public void addUsersUsingMembershipService(ExtServer extServer, Long lessonId, String courseId,
-	    String resourceLinkId) throws IOException, UserInfoFetchException, UserInfoValidationException {
+	    String resourceLinkId, String customContextMembershipUrl)
+	    throws IOException, UserInfoFetchException, UserInfoValidationException {
 
-	String membershipUrl = extServer.getMembershipUrl();
-	//if tool consumer haven't provided  membershipUrl (ToolProxyBinding.memberships.url parameter) we can't add any users
+	String membershipUrl = customContextMembershipUrl;
 	if (StringUtils.isBlank(membershipUrl)) {
+	    membershipUrl = extServer.getMembershipUrl();
+	}
+
+	// if tool consumer haven't provided  membershipUrl (ToolProxyBinding.memberships.url parameter) we can't add any users
+	if (StringUtils.isBlank(membershipUrl)) {
 	    return;
 	}
 
-	membershipUrl += membershipUrl.contains("?") ? "&" : "?";
-	membershipUrl += "rlid=" + resourceLinkId;
+	if (StringUtils.isNotBlank(resourceLinkId)) {
+	    membershipUrl += membershipUrl.contains("?") ? "&" : "?";
+	    membershipUrl += "rlid=" + resourceLinkId;
+	}
 
 	log.debug("Make a call to remote membershipUrl:" + membershipUrl);
 	HttpGet ltiServiceGetRequest = new HttpGet(membershipUrl);