User-Agent becomes User-agent

While doing lots of testing with siproxd and SIP video endpoints, I
ran into a strange problem where I couldn't make successful calls to
one video endpoint brand and software release when going over siproxd.
Detailed trace analysis together with the vendor shed some light:

siproxd rewrites the SIP headers and changes upper/lower cases:
"User-Agent" becomes "User-agent". Basically only the first letter of
each keyword is capitalized. The RFC clearly states that keywords are
case-insensitive.

Anyone else seeing similar non-compliance issues? I simply added a
quick hack for now to siproxd to write 'User-Agent' as requested until
that software release is phased out. The vendor already fixed it.

Marcel

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