Re: [Sip] Back-to-Back User Agent Ttransparency Top 10 list

["Dean Willis" <dean.willis@softarmor.com>]

Padma asked:

> "4) Header transparency: The B2BUA doesn't change headers that transit
it."
>
> This mail seems to suggest that a B2BUA forwards the headers to the
other endpoint (in other words does not change the headers that transit
it) .
>
> Am I wrong in this assumption?
>
> The content of this mail would definitely be pretty useful in a draft on
the B2BUA.

A B2BUA that has the propoerty of header transparency would not change
headers, as said. However, not all B2BUAs have such a property. For
example, the 3GPP Topology Hiding Internetwork Gateway,  or THIG,
transforms headers that reveal topology information about the operator
network. The DCS/PacketCable "Anonymizer" transforms headers that reveal
the identity or location of a caller. Even a basic proxy actually changes
some headers, for example Via and possibly Route and Record-Route.

--
Dean

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