diff --git a/app/src/main/kotlin/com/tutpro/baresip/AudioActivity.kt b/app/src/main/kotlin/com/tutpro/baresip/AudioActivity.kt
index 8039dc1c..43e3b947 100644
--- a/app/src/main/kotlin/com/tutpro/baresip/AudioActivity.kt
+++ b/app/src/main/kotlin/com/tutpro/baresip/AudioActivity.kt
@@ -329,7 +329,7 @@ class AudioActivity : AppCompatActivity() {
     }
 
     companion object {
-        val audioModules = listOf("opus", "amr", "g722", "g7221", "g726", "g729", "g711")
+        val audioModules = listOf("opus", "amr", "g722", "g7221", "g726", "g729", "gsm", "g711")
     }
 
 }