[Sip] Proxy inserting Record-Route

[hisham.khartabil@nokia.com]

RFC3261 says:

"If this proxy wishes to remain on the path of future requests
         in a dialog created by this request (assuming the request
         creates a dialog), it MUST insert a Record-Route header field
         value into the copy before any existing Record-Route header
         field values, even if a Route header field is already present."

It fails to mention where the proxy should adds that record-route header. On top or bottom of the existing record-route headers. I deduce that it should add it on top since a UAS must copy record-route headers to a response reserving the order. Also a UAC creating a route-set uses these record-route headers taking them in reverse order.

Did I miss it in the spec?

Regards,
Hisham
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