diff --git a/conf/autoload_configs/portaudio.conf.xml b/conf/autoload_configs/portaudio.conf.xml
index 1f758de896..7389bf49cd 100644
--- a/conf/autoload_configs/portaudio.conf.xml
+++ b/conf/autoload_configs/portaudio.conf.xml
@@ -5,12 +5,14 @@
 	 or the device number prefixed with # eg "#1" (or blank for default) -->
 
     <!-- device to use for input -->
-    <param name="indev" value=""/>
+    <param name="indev" value="Built-in Input"/>
     <!-- device to use for output -->
-    <param name="outdev" value=""/>
+    <!--<param name="outdev" value="Built-in Output"/>-->
+    <param name="outdev" value="#2"/>
 
     <!--device to use for inbound ring -->
-    <!--<param name="ringdev" value=""/>-->
+    <param name="ringdev" value="Built-in Output"/>
+
     <!--File to play as the ring sound -->
     <!--<param name="ring-file" value="/sounds/ring.wav"/>-->
     <!--Number of seconds to pause between rings -->
@@ -29,7 +31,30 @@
     <param name="cid-num" value="$${outbound_caller_id}"/>
 
     <!--audio sample rate and interval -->
-    <param name="sample-rate" value="48000"/>
+    <!--<param name="sample-rate" value="48000"/>-->
+    <param name="sample-rate" value="8000"/>
     <param name="codec-ms" value="20"/>
   </settings>
+
+  <shared-devices>
+  	<device friendly-name="usb1" device="#2">
+		<param name="channels" value="2" />
+		<param name="sample-rate" value="8000" />
+		<param name="codec-ms" value="20" />
+  	</device>
+  </shared-devices>
+
+  <endpoints>
+
+  	<endpoint name="usbout-left">
+		<param name="outdev" value="usb1:0" />
+	</endpoint>
+
+  	<endpoint name="usbout-right">
+		<param name="outdev" value="usb1:1" />
+	</endpoint>
+
+  </endpoints>
+
 </configuration>
+
diff --git a/src/mod/endpoints/mod_portaudio/mod_portaudio.c b/src/mod/endpoints/mod_portaudio/mod_portaudio.c
index baa33d456e..d02a3ead07 100644
--- a/src/mod/endpoints/mod_portaudio/mod_portaudio.c
+++ b/src/mod/endpoints/mod_portaudio/mod_portaudio.c
@@ -106,6 +106,34 @@ struct audio_stream {
 };
 typedef struct audio_stream audio_stream_t;
 
+typedef struct _pa_shared_device {
+	/*! Sampling rate */
+	int sample_rate;
+	/*! */
+	int codec_ms;
+	/*! Device number */
+	int devno;
+	/*! Running stream (if a stream is already running for devno) */
+	audio_stream_t *stream;
+	/*! The actual portaudio device number */
+	/*! It's a shared device after all */
+	switch_mutex_t *mutex;
+} pa_shared_device_t;
+
+typedef struct _pa_endpoint {
+	/*! Input device for this endpoint */
+	pa_shared_device_t *indev;
+
+	/*! Output device for this endpoint */
+	pa_shared_device_t *outdev;
+
+	/*! Channel index within the input device stream */
+	int inchan;
+
+	/*! Channel index within the input device stream */
+	int outchan;
+} pa_endpoint_t;
+
 static struct {
 	int debug;
 	int port;
diff --git a/src/mod/endpoints/mod_portaudio/pablio.h b/src/mod/endpoints/mod_portaudio/pablio.h
index 0bd3c41e46..6d99d2f012 100644
--- a/src/mod/endpoints/mod_portaudio/pablio.h
+++ b/src/mod/endpoints/mod_portaudio/pablio.h
@@ -56,17 +56,19 @@ extern "C" {
 
 #include <string.h>
 
-	typedef struct {
-		PaUtilRingBuffer inFIFO;
-		PaUtilRingBuffer outFIFO;
-		PaStream *istream;
-		PaStream *ostream;
-		PaStream *iostream;
-		int bytesPerFrame;
-		int do_dual;
-		int has_in;
-		int has_out;
-	} PABLIO_Stream;
+#define MAX_IO_CHANNELS 2
+typedef struct {
+	PaStream *istream;
+	PaStream *ostream;
+	PaStream *iostream;
+	int bytesPerFrame;
+	int do_dual;
+	int has_in;
+	int has_out;
+	PaUtilRingBuffer inFIFOs[2]
+	PaUtilRingBuffer outFIFOs[2]
+	int channelCount;
+} PABLIO_Stream;
 
 /* Values for flags for OpenAudioStream(). */
 #define PABLIO_READ     (1<<0)