diff --git a/callattendant/app.cfg.example b/callattendant/app.cfg.example
index 05ac58b..64ab3f1 100644
--- a/callattendant/app.cfg.example
+++ b/callattendant/app.cfg.example
@@ -74,6 +74,14 @@ BLOCK_NAME_PATTERNS = {"V[0-9]{15}": "Telemarketer Caller ID", }
 #   Example: {"P": "Private number", "O": "Out of area",}
 BLOCK_NUMBER_PATTERNS = {}
 
+# BLOCK_SERVICE: The name of the online service used to lookup robocallers and spam numbers.
+#   Currently, only NOMOROBO is supported and it is for the USA. Areas outside the USA should set
+#   to blank. When the online service is blank (disabled), only the blacklist and blocked
+#   name/number patterns are used to block numbers.
+#
+#   Example: "NOMOROBO" (USA)  or "" (disabled).
+BLOCK_SERVICE = "NOMOROBO"
+
 
 # BLOCKED_ACTIONS: A tuple containing a combination of the following actions:
 #   "greeting", "record_message", "voice_mail".
diff --git a/callattendant/app.py b/callattendant/app.py
index 034bece..bb3f6e2 100755
--- a/callattendant/app.py
+++ b/callattendant/app.py
@@ -26,6 +26,7 @@
 import sys
 import queue
 import sqlite3
+import time
 from pprint import pprint
 from shutil import copyfile
 
@@ -115,6 +116,10 @@ def process_calls(self):
         # Instruct the modem to start feeding calls into the caller queue
         self.modem.handle_calls(self.handle_caller)
 
+        # If testing, allow queue to be filled before processing for clean, readable logs
+        if self.config["TESTING"]:
+            time.sleep(1)
+
         # Process incoming calls
         while 1:
             try:
diff --git a/callattendant/config.py b/callattendant/config.py
index 902fa5f..378dbf9 100644
--- a/callattendant/config.py
+++ b/callattendant/config.py
@@ -32,6 +32,7 @@
     "PHONE_DISPLAY_FORMAT": "###-###-####",
 
     "BLOCK_ENABLED": True,
+    "BLOCK_SERVICE": "NOMOROBO",
     "BLOCK_NAME_PATTERNS": {"V[0-9]{15}": "Telemarketer Caller ID", },
     "BLOCK_NUMBER_PATTERNS": {},
 
diff --git a/callattendant/screening/callscreener.py b/callattendant/screening/callscreener.py
index f81d444..4898f02 100644
--- a/callattendant/screening/callscreener.py
+++ b/callattendant/screening/callscreener.py
@@ -62,14 +62,15 @@ def is_blacklisted(self, callerid):
                         reason = block["number_patterns"][key]
                         print(reason)
                         return True, reason
-                print(">> Checking nomorobo...")
-                result = self._nomorobo.lookup_number(number)
-                if result["spam"]:
-                    reason = "{} with score {}".format(result["reason"], result["score"])
-                    if self.config["DEBUG"]:
-                        print(">>> {}".format(reason))
-                    self.blacklist_caller(callerid, reason)
-                    return True, reason
+                if block["service"].upper() == "NOMOROBO":
+                    print(">> Checking nomorobo...")
+                    result = self._nomorobo.lookup_number(number)
+                    if result["spam"]:
+                        reason = "{} with score {}".format(result["reason"], result["score"])
+                        if self.config["DEBUG"]:
+                            print(">>> {}".format(reason))
+                        self.blacklist_caller(callerid, reason)
+                        return True, reason
                 print("Caller has been screened")
                 return False, "Not found"
         finally: