diff --git a/rtu/configure.lua b/rtu/configure.lua
index 2b6239e..c1ab9db 100644
--- a/rtu/configure.lua
+++ b/rtu/configure.lua
@@ -1144,7 +1144,7 @@ local function config_view(display)
 
         tool_ctl.importing_any_dc = false
 
-        tmp_cfg.SpeakerVolume = config.SOUNDER_VOLUME
+        tmp_cfg.SpeakerVolume = config.SOUNDER_VOLUME or 1
         tmp_cfg.SVR_Channel = config.SVR_CHANNEL
         tmp_cfg.RTU_Channel = config.RTU_CHANNEL
         tmp_cfg.ConnTimeout = config.COMMS_TIMEOUT
diff --git a/rtu/startup.lua b/rtu/startup.lua
index d05ffe8..0a3753d 100644
--- a/rtu/startup.lua
+++ b/rtu/startup.lua
@@ -31,7 +31,7 @@ local sna_rtu      = require("rtu.dev.sna_rtu")
 local sps_rtu      = require("rtu.dev.sps_rtu")
 local turbinev_rtu = require("rtu.dev.turbinev_rtu")
 
-local RTU_VERSION = "v1.7.10"
+local RTU_VERSION = "v1.7.11"
 
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
 local RTU_UNIT_HW_STATE = databus.RTU_UNIT_HW_STATE