Regarding portability, without prejudice to agreement on the use of ACQ method, especially from NOS on the use of the SIP URI format, VODAFONE and NOWO/ONI made proposals that differ from what MEO presented. MEO claims that the proposed format is the international format, and in accordance with the relevant standards (“RFC 3261”, “RFC 3966” and ITU-T “E.164”), matching the format adopted for its own network, therefore any changes in this context would incur costs. In relation to numbering, VODAFONE raised issues concerning the use of the international numbering format provided for in the offer, since its network is not configured under the terms proposed. Consideration of the contribution of operators to MEO’s proposal The proposal also mentioned that in the context of TDM interconnection MEO intends to continue to use the “Query on Release” (QoR) method, which it mentions being in accordance with the provisions of the Portability Regulation. If the destination number has not been ported, the field “npdi” should be added in order to signal that the “query” to the portability database has been made. MEO also stated that should a call be routed to another operator’s interconnection equipment following the reply obtained in the ACQ process, then there should “(.) be added to the resquest URI of the SIP INVITE message that initiates the dialogue the fields “rn=D0xyabc rn-context=+351 npdi” or “rn=+351D0xyabc npdi” (“D0xyabc” represents the NRN – Network Routing Number – “D0xy” represents the operator to which the number was ported, and “abc” is that operator’s network element to which the destination number is now connected)”. In terms of portability, the proposal established the use of the “all call query” (ACQ) by the operator sending the traffic (even in transit situations), and when the destination number has been ported to a new operator, it will receive the “Routing Number” information associated with it and the call should be routed based on this information, and not based on the digits that compose the destination number. The use of “+” is mandatory and it should be immediately followed by prefix “351” for calls destined for the national network. The proposal provides that the destination number should use the SIP URI 1 format under the terms defined in standard “RFC 3966”, 2 it should be a valid “E.164” 3 number preceded by the character “+”, and include the “user=phone” parameter pursuant to standard “RFC 3261” (section 19.1.1.). The destination number must be represented by a set of decimal numbers that enable to unequivocally identify the network point where the call should terminate. MEO's proposal states it is the operators’ obligation to ensure that they only use the numbers assigned to them by ANACOM, under the terms of the National Numbering Plan (NNP), and to ensure the transmission of information about the calling line identification (CLI), including the information needed to enable its restriction, as long as it has been provided by the originating (or transit) operator. 2.3.2. Consideration of the contribution of operators to MEO's proposal.
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