[sr-dev] [kamailio/kamailio] CANCEL msg results in "500 cancel error" because of "duplicate From header" error (#2572)

[Justin LaVelle]

Ok I found the issue with the INVITE, it doesn't have multiple "From" headers. But it does have a "From-Person:12345" header that we use to track the customer id that initiated the call. So that explains why calls from a PSTN source didn't have the issue.

I tried a change to our system to change the header from "From-Person" to "Src-Person" and it that works fine on 5.4.2 no more duplicate From header error the Callee gets the CANCEL msg just fine.

So Kamailio is maybe doing a "starts with" type match when finding the "From" header then as of 5.3? Is that correct? We've had this header in place for years now an only with this upgrade have the error. Is Kamailio behaving properly here? 
I've searched but couldn't find anything in that would suggest headers starting with "From" to be not allowed.

Here is the original INVITE ( From-Person header is second to last )
```
INVITE sip:john.webrtc at bf96cc.domain.com SIP/2.0
v:SIP/2.0/UDP a.b.c.d:5081;rport;branch=z9hG4bKgZ5FU4aUKXjXm
Route:<sip:kam3.rtp.lax.domain.net:5060>
Max-Forwards:68
f:"user 1002"<sip:+1002 at bf96cc.domain.com>;tag=8FUg427jU6pva
t:<sip:john.webrtc at bf96cc.domain.com>
i:98fa8010-afa4-1239-1dba-ea02c604123e
CSeq:28924569 INVITE
m:<sip:mod_sofia at 206.15.136.103:5081>
User-Agent:fs
Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY,PUBLISH,SUBSCRIBE
k:timer,path,replaces
u:talk,hold,conference,presence,as-feature-event,dialog,line-seize,call-info,sla,include-session-description,presence.winfo,message-summary,refer
c:application/sdp
Content-Disposition:session
l:482
From-Person:12345
Remote-Party-ID:"user 1002"<sip:+1002 at bf96cc.domain.com>;party=calling;screen=yes;privacy=off

<SDP DATA>
```

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