7. Error Situations

   If a compressed SIP request arrives to a SIP server that does not
   understand SigComp, the server will not have any means to indicate
   the error to the client.  The message will be impossible to parse,
   and there will be no Via header field indicating an address to send
   an error response.

   If a SIP client sends a compressed request and the client transaction
   times out without having received any response, the client SHOULD
   retry the same request without using compression.  If the compressed
   request was sent over a TCP connection, the client SHOULD close that
   connection and open a new one to send the uncompressed request.
   Otherwise the server would not be able to detect the beginning of the
   new message.