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3.9.5.8 Generating 199 Response

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This section follows the product behavior described in endnote <60>.

If a proxy receives a non 2XX  final response from one of the targets and the SIP proxy decides to keep or drop the final response, the proxy SHOULD generate a 199 response in accordance with [IETFDRAFT-RCITD-199-01] if:

  1. A 18X response from that target had been proxied through to the caller, and

  2. A 199 response was not already sent for this target.