Are VoIP clients supposed to set TOS to minimum delay?

Linux Advanced Routing and Traffic Control

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Hi all

Tcpdump shows Kphone UDP traffic has not set as
minimum delay traffic!

This is a tcpdump from My-IP to Other-IP:

13:07:14.704501 IP (tos 0x0, ttl  64, id 813, offset
0, flags [DF], proto: UDP (17), length: 120)
My-IP.32784 > Other-IP.10384: UDP, length 92
        0x0000:  4500 0078 032d 4000 4011 0fce db4a
37e4
        0x0010:  d5ba 3e91 8010 2890 0064 50f7 8008
032e
        0x0020:  ff63 f69f 0a00 0000 d4d4 d4d4 d4d4
d4d4
        0x0030:  d4d5 d5d5

Here TOS is 0x0, that is, normal traffic! Are VoIP
clients supposed to set TOS to minimum delay? Is there
any reason for this? Or is this something developers
over
looked?


Many thanks in advance.

Best Regards
Unga

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