why my wireshark can't capture SIP packet.

[梁泰伦 <liangtailun () gmail com>]

when I try to use wireshark to capture SIP packet about two aplication that
base on JAIN-SIP in windows.I can't find some packet associate with SIP or
other associated informantion.
But I can capture other packet like tcp udp and so on.How can I do to
capture sip message?
my English speaking is poor.
thanks for your help.

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