Vendor-specific header lines are ok. Just be prepared that the IETF will
redefine your favorite header, so documenting your extension, according
to the published IANA procedures, is far superior.

Jean-Francois Mule wrote:
> 
> Some vendors are inserting some vendor-specific request header lines
> (one example we have is in the INVITE for example).  I do not believe
> this is allowed.
> 
> The particular vendor-specific header line is in the form of:
> vendorx-hname: vendorx-hvalue
> 
> If this is allowed, it seems to be a recipe for allowing *:* in our sip
> parsers...

Proxies need to be handle any valid header, i.e., Header:
something-or-other
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