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[Sip] Request for clarificattion - Empty Request-URI towards proxy

I need some clarification about the expected behaviour of a proxy receiving an INVITE request with an Empty request-URI.

According to the current ETSI test specification (see test purpose below) we expect a 480 (temporary unavailable) request failure response.

I receive comments saying that 404 is also valid according to rfc3261.

Could you help to resolve this statement?
Which error codes should be accepted.

Note that the last paragraph of 16.5, which leaded to that test purpose is unclear:
   If the target set remains empty after applying all of the above, the
   proxy MUST return an error response, which SHOULD be the 480
   (Temporarily Unavailable) response.

The current test purpose:
Doc reference: ETSI - DTS/MTS-0097-2
Test Purpose Nr : SIP_CC_PR_MP_RQ_V_010
Ensure that the IUT on receipt of an INVITE request but does not find any target to forward, sends back a Temporary Unavailable [480 Temporary Unavailable] request failure response

Please notice that the interest on SIP test specification is growing, and some opeartor in europe are now using the ETSI test specifications to make certification and select the equipment they will purchase.
Do not hesitate to subscribe to the dedicated SIP testing list:
Send an email to: listserv at list.etsi.org, subject: registration; body: subscribe mts-ipt-sip

Further requests for clarification will follow.

Thanks in advance for your help.

Regards
Francois FISCHER - STF expert
*************************************************
ETSI
Einstein Building - 650 route des Lucioles
F-06560 Sophia Antipolis cedex, FRANCE
*************************************************
Tel: +33 (0)4 92944330 - Fax: +33 (0)4 92385244
Email: francois.fischer at etsi.org

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