diff --git a/odysseus_tree/board/tpu/config.txt b/odysseus_tree/board/tpu/config.txt
index b244504..209eb85 100755
--- a/odysseus_tree/board/tpu/config.txt
+++ b/odysseus_tree/board/tpu/config.txt
@@ -76,3 +76,5 @@ hdmi_force_hotplug:1=1
 
 # for HDMI 1
 framebuffer_priority=7
+
+dtparam=audio=on
diff --git a/odysseus_tree/configs/raspberrypi4_64_tpu_defconfig b/odysseus_tree/configs/raspberrypi4_64_tpu_defconfig
index 3951b95..b55c133 100644
--- a/odysseus_tree/configs/raspberrypi4_64_tpu_defconfig
+++ b/odysseus_tree/configs/raspberrypi4_64_tpu_defconfig
@@ -24,6 +24,9 @@ BR2_LINUX_KERNEL_INTREE_DTS_NAME="broadcom/bcm2711-rpi-4-b broadcom/bcm2711-rpi-
 BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
 BR2_PACKAGE_LINUX_TOOLS_GPIO=y
 BR2_PACKAGE_BUSYBOX_SHOW_OTHERS=y
+BR2_PACKAGE_ALSA_UTILS=y
+BR2_PACKAGE_ALSA_UTILS_APLAY=y
+BR2_PACKAGE_ALSA_UTILS_SPEAKER_TEST=y
 BR2_PACKAGE_XZ=y
 BR2_PACKAGE_ZSTD=y
 BR2_PACKAGE_GIT=y
@@ -55,6 +58,7 @@ BR2_PACKAGE_LM_SENSORS=y
 BR2_PACKAGE_PPS_TOOLS=y
 BR2_PACKAGE_RASPI_GPIO=y
 BR2_PACKAGE_PYTHON_SERIAL=y
+# BR2_PACKAGE_ALSA_LIB_RAWMIDI is not set
 BR2_PACKAGE_CA_CERTIFICATES=y
 BR2_PACKAGE_OPENSSL=y
 BR2_PACKAGE_PIXMAN=y
@@ -74,6 +78,7 @@ BR2_PACKAGE_IPERF3=y
 BR2_PACKAGE_IPROUTE2=y
 BR2_PACKAGE_IPUTILS=y
 BR2_PACKAGE_IW=y
+BR2_PACKAGE_LINPHONE=y
 BR2_PACKAGE_WIRELESS_REGDB=y
 BR2_PACKAGE_WPA_SUPPLICANT=y
 BR2_PACKAGE_WPA_SUPPLICANT_DEBUG_SYSLOG=y
diff --git a/odysseus_tree/overlays/rootfs_overlay_tpu/etc/init.d/S99linphonecsh b/odysseus_tree/overlays/rootfs_overlay_tpu/etc/init.d/S99linphonecsh
new file mode 100755
index 0000000..b823b08
--- /dev/null
+++ b/odysseus_tree/overlays/rootfs_overlay_tpu/etc/init.d/S99linphonecsh
@@ -0,0 +1,34 @@
+#!/bin/sh
+
+start() {
+        printf "Starting linphone with settings "
+        linphonecsh init
+        sleep 1s
+        linphonecsh generic "autoanswer enable"
+        linphonecsh generic "firewall none"
+}
+stop() {
+        printf "Stopping linphone"
+        linphonecsh exit
+}
+restart() {
+        stop
+        start
+}
+
+case "$1" in
+  start)
+        start
+        ;;
+  stop)
+        stop
+        ;;
+  restart|reload)
+        restart
+        ;;
+  *)
+        echo "Usage: $0 {start|stop|restart}"
+        exit 1
+esac
+
+exit $?