diff --git a/lib/call_attempt_repo.rb b/lib/call_attempt_repo.rb
index 0c9b268ee8aeba8341cde3a09a7cd1329b260a7a..0aed365720435be88ee27c72bd4b911fbcd1b3fd 100644
--- a/lib/call_attempt_repo.rb
+++ b/lib/call_attempt_repo.rb
@@ -59,7 +59,10 @@ protected
 		find_all(customer, other_tel, direction).then do |(rate, usage, tl, c)|
 			CallAttempt.for(
 				customer: customer, rate: rate, usage: usage,
-				supported: rate && tl.support_call?(rate, c || 0),
+				supported:
+					rate &&
+					tl.support_call?(rate, c || 0) &&
+					other_tel !~ /\A\+?1?[94]11/,
 				direction: direction, **kwargs
 			)
 		end
diff --git a/test/test_web.rb b/test/test_web.rb
index 97bdada96654f473c9e4d61d8fa98035a9856cf0..0f34bdab14cf5e4c260eb3367c6dbecb0c66a671 100644
--- a/test/test_web.rb
+++ b/test/test_web.rb
@@ -110,6 +110,7 @@ class WebTest < Minitest::Test
 			redis: FakeRedis.new,
 			db: FakeDB.new(
 				["test_usd", "+15557654321", :outbound] => [{ "rate" => 0.01 }],
+				["test_usd", "+1911", :outbound] => [{ "rate" => 0.01 }],
 				["test_usd", "+15557654321", :inbound] => [{ "rate" => 0.01 }],
 				["test_usd", "+14445556666", :inbound] => [{ "rate" => 0.01 }],
 				["test_usd", "+18001234567", :outbound] => [{ "rate" => 0.00 }],
@@ -272,6 +273,27 @@ class WebTest < Minitest::Test
 	end
 	em :test_outbound_unsupported
 
+	def test_outbound_unsupported_short_numbers_911
+		post(
+			"/outbound/calls",
+			{
+				from: "ccustomerid",
+				to: "+1911",
+				callId: "acall"
+			}.to_json,
+			{ "CONTENT_TYPE" => "application/json" }
+		)
+
+		assert last_response.ok?
+		assert_equal(
+			"<?xml version=\"1.0\" encoding=\"utf-8\" ?><Response>" \
+			"<SpeakSentence>The number you have dialled is not " \
+			"supported on your account.</SpeakSentence></Response>",
+			last_response.body
+		)
+	end
+	em :test_outbound_unsupported_short_numbers_911
+
 	def test_outbound_atlimit
 		post(
 			"/outbound/calls",