/.*?/s isn't enough to prevent that part of the regex from gobbling up multiple lines and also backtracking pathologically. For example, your regex will incorrectly match (after you fix \r \n? to \r? \n or just \n): 

From: "Bungalo Bill" ...
To: (wrong number)
Call-ID: (wrong call)
...
From: "Wrong Person" ...
To: <sip:66666­66666@...>
Call-ID: ThisIsTheWrongCallID

[download]

- tye        

In reply to Re^2: Soliciting Multiline SIP Searching Suggestions (.*) by tye
in thread Soliciting Multiline SIP Searching Suggestions by $dancarlson

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