[android-developers] Question about IP packet header's TOS(& DSCP) field marking

Hi, i am making a small android application which VoIP program based
in SIP(Session Initiation Protocol) using the android default
emulator(version : Android SDK 2.2)
Through this program, i will support the QoS for each service such as
voice telephony,
SMS messaging and so on. So, i want to mark the TOS field(8bit) in IP
packet header to grant priority each service IP packets.

As you know, there is a method "setTrafficClass(int value)" in
android
UDP socket API. But, after capturing the packets using the wireshark,
i could found that this API is not effect. In short, the UDP socket
always sends packets with default IP TOS field, 0x00.

Does anybody know why this problem occurs?
Does android prohibit chaging IP header process on purpose?
Is android emulator's limitation?

Plz, give me some advice about this problem.

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