diff --git a/Lib/plat-sunos4/SUNAUDIODEV.py b/Lib/plat-sunos4/SUNAUDIODEV.py
new file mode 100755
index 0000000..7e46871
--- /dev/null
+++ b/Lib/plat-sunos4/SUNAUDIODEV.py
@@ -0,0 +1,25 @@
+# Symbolic constants for use with sunaudiodev module
+# The names are the same as in audioio.h with the leading AUDIO_
+# removed.
+
+# Encoding types, for fields i_encoding and o_encoding
+
+ENCODING_ULAW = 1
+ENCODING_ALAW = 2
+
+# Gain ranges for i_gain, o_gain and monitor_gain
+
+MIN_GAIN = 0
+MAX_GAIN = 255
+
+# Port names for i_port and o_port
+
+PORT_A = 1
+PORT_B = 2
+PORT_C = 3
+PORT_D = 4
+
+SPEAKER = PORT_A
+HEADPHONE = PORT_B
+
+MICROPHONE = PORT_A