diff --git a/proxy/main.go b/proxy/main.go
index c8008b0..18f7bf5 100644
--- a/proxy/main.go
+++ b/proxy/main.go
@@ -36,6 +36,8 @@ import (
 
 	"github.com/dlintw/goconf"
 	"github.com/gorilla/mux"
+
+	signaling "github.com/strukturag/nextcloud-spreed-signaling"
 )
 
 var (
@@ -90,7 +92,7 @@ func main() {
 	}
 	defer proxy.Stop()
 
-	if addr, _ := config.GetString("http", "listen"); addr != "" {
+	if addr, _ := signaling.GetStringOptionWithEnv(config, "http", "listen"); addr != "" {
 		readTimeout, _ := config.GetInt("http", "readtimeout")
 		if readTimeout <= 0 {
 			readTimeout = defaultReadTimeout
diff --git a/proxy/proxy_server.go b/proxy/proxy_server.go
index 6978c0e..b0842df 100644
--- a/proxy/proxy_server.go
+++ b/proxy/proxy_server.go
@@ -223,7 +223,7 @@ func (s *ProxyServer) checkOrigin(r *http.Request) bool {
 }
 
 func (s *ProxyServer) Start(config *goconf.ConfigFile) error {
-	s.url, _ = config.GetString("mcu", "url")
+	s.url, _ = signaling.GetStringOptionWithEnv(config, "mcu", "url")
 	if s.url == "" {
 		return fmt.Errorf("No MCU server url configured")
 	}
diff --git a/proxy_config_static.go b/proxy_config_static.go
index 84f7548..eda67d7 100644
--- a/proxy_config_static.go
+++ b/proxy_config_static.go
@@ -86,7 +86,7 @@ func (p *proxyConfigStatic) configure(config *goconf.ConfigFile, fromReload bool
 		remove[u] = ips
 	}
 
-	mcuUrl, _ := config.GetString("mcu", "url")
+	mcuUrl, _ := GetStringOptionWithEnv(config, "mcu", "url")
 	for _, u := range strings.Split(mcuUrl, " ") {
 		u = strings.TrimSpace(u)
 		if u == "" {
diff --git a/server/main.go b/server/main.go
index 05f32c3..9ee6afd 100644
--- a/server/main.go
+++ b/server/main.go
@@ -171,7 +171,7 @@ func main() {
 
 	signaling.RegisterStats()
 
-	natsUrl, _ := config.GetString("nats", "url")
+	natsUrl, _ := signaling.GetStringOptionWithEnv(config, "nats", "url")
 	if natsUrl == "" {
 		natsUrl = nats.DefaultURL
 	}
@@ -224,7 +224,7 @@ func main() {
 		log.Fatal("Could not create hub: ", err)
 	}
 
-	mcuUrl, _ := config.GetString("mcu", "url")
+	mcuUrl, _ := signaling.GetStringOptionWithEnv(config, "mcu", "url")
 	mcuType, _ := config.GetString("mcu", "type")
 	if mcuType == "" && mcuUrl != "" {
 		log.Printf("WARNING: Old-style MCU configuration detected with url but no type, defaulting to type %s", signaling.McuTypeJanus)
@@ -274,7 +274,7 @@ func main() {
 					if config, err = goconf.ReadConfigFile(*configFlag); err != nil {
 						log.Printf("Could not read configuration from %s: %s", *configFlag, err)
 					} else {
-						mcuUrl, _ = config.GetString("mcu", "url")
+						mcuUrl, _ = signaling.GetStringOptionWithEnv(config, "mcu", "url")
 						mcuType, _ = config.GetString("mcu", "type")
 						if mcuType == "" && mcuUrl != "" {
 							log.Printf("WARNING: Old-style MCU configuration detected with url but no type, defaulting to type %s", signaling.McuTypeJanus)
@@ -328,7 +328,7 @@ func main() {
 
 	var listeners Listeners
 
-	if saddr, _ := config.GetString("https", "listen"); saddr != "" {
+	if saddr, _ := signaling.GetStringOptionWithEnv(config, "https", "listen"); saddr != "" {
 		cert, _ := config.GetString("https", "certificate")
 		key, _ := config.GetString("https", "key")
 		if cert == "" || key == "" {
@@ -366,7 +366,7 @@ func main() {
 		}
 	}
 
-	if addr, _ := config.GetString("http", "listen"); addr != "" {
+	if addr, _ := signaling.GetStringOptionWithEnv(config, "http", "listen"); addr != "" {
 		readTimeout, _ := config.GetInt("http", "readtimeout")
 		if readTimeout <= 0 {
 			readTimeout = defaultReadTimeout