RFC3261 section 21.5.4 discusses the impacts of receiving a 503. Because the second paragraph second sentence makes a qualification concerning the retry-after header, the second paragraph first sentence (and rfc3263 section 4.3) does still apply when no retry-after header present within the 503. Is my interpretation of this section correct?
RFC3261 section 21.5.4: "The server is temporarily unable to process the request due to a temporary overloading or maintenance of the server. The server MAY indicate when the client should retry the request in a Retry-After header field. If no Retry-After is given, the client MUST act as if it had received a 500 (Server Internal Error) response. A client (proxy or UAC) receiving a 503 (Service Unavailable) SHOULD attempt to forward the request to an alternate server. It SHOULD NOT forward any other requests to that server for the duration specified in the Retry-After header field, if present. Servers MAY refuse the connection or drop the request instead of responding with 503 (Service Unavailable)." _______________________________________________ Sip-implementors mailing list Sip-implementors@cs.columbia.edu https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
