Should payload dissectors' (RTP) packets depend on call-setup dissectors' (SIP) packets?

[Jeff Morriss <jeff.morriss.ws () gmail com>]

One of the more frequently asked questions/reported bugs is users 
filtering for RTP, saving^W exporting those displayed packets, then 
opening the new capture file only to find plain UDP.  This is because 
the call-setup protocol (e.g., SIP) wasn't included in the display filter.

Now we have the ability to mark frames as dependent on others.  Should, 
for example, RTP frames mark the call-setup frames as dependencies?  (I 
noticed that RTP has a Setup Frame field; would one frame really be enough?)
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