Re: filter application layer frames during capture kernel (SIP)

[Anders Broman <anders.broman () ericsson com>]

Hi,
If I get your question right you want a capture filter for specific SIP “fields”. This question on ask Wireshark 
discuss a similar topic:
https://ask.wireshark.org/question/1320/how-would-i-map-this-display-filter-to-a-capture-filter/

“he mechanisms that implement capture filters (a mechanism in libpcap and various OS kernels, where the filter is 
compiled into a pseudo-machine program and interpretively executed or translated to machine code and executed)…” 
“…there is no general mechanism for turning a display filter into a capture filter (and some display filters simply 
cannot be turned into display filters, as the BPF pseudo-machine does not support looping and thus cannot handle any 
protocol whose dissection requires a loop).”

If your SIP signaling happens between known IP addresses and ports you can use those as capture filter to only capture 
SIP traffic.
Regards
Anders

From: Wireshark-users [mailto:wireshark-users-bounces () wireshark org] On Behalf Of Manolis Katsidoniotis
Sent: den 23 januari 2018 14:11
To: wireshark-users () wireshark org
Subject: [Wireshark-users] filter application layer frames during capture kernel (SIP)

Hello

Maybe this has been requested in the past but I would like to ask if anyone knows how to filter out specific SIP frames 
during capture in wireshark and/or tcpdump ...

Thanks
Manolis

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