I have no speaker sound in 3CXPhone for Android version 1.3.4 on my SonyEricsson Xperia Arc. Even if the other part puts the call on hold there’s no sound (no MOH). I use the Android together with 3CXPhone for Windows (version 6.0) and 3CX Phone System version 10 running in Windows XP SP3. The sound works fine in the opposite direction (i.e., from Android to Windows). The situation is the same wherever the call is initiated. The Xperia runs Android version 2.3.4.