T 0578/16 (Negotiating SDP versions/HUAWEI) 14-07-2020

1. Background of the patent

The patent relates to the negotiation of a version of the session description protocol (SDP) used in the communication between two network entities, those entities being further characterised as a media gateway (MG) and a media gateway controller (MGC) respectively.

2. Patent as granted (main request) - Article 100(c) EPC

2.1 Claim 1 as granted includes the following limiting features (as labelled by the board):

A method for negotiating an SDP version comprising:

(a) requesting an MG, by an MGC, for information of an SDP version supported by the MG;

(b) returning, by the MG, information of a locally supported SDP version to the MGC in response to the request;

(c) selecting, by the MGC, an SDP version to be used, the SDP version being supported by both the MGC and the MG;

(d) informing the MG, by the MGC, of corresponding information of the SDP version to be used.

2.2 The application underlying the opposed patent had been originally filed as International patent application in the Chinese language. An English translation had been filed when entering the European phase. The board notes that it is permissible under Article 14(2) EPC to bring the translation into conformity with the original application throughout the whole proceedings before the EPO including the appeal proceedings.

2.3 In the present case, as regards feature (c), it is therefore permissible to replace "local terminal" by "first network entity" (i.e. the "MGC" in claim 1) if clear evidence is provided that this is the correct translation of the original Chinese term used for the relevant component in the present application (see also T 700/05, Reasons, point 4; T 1483/10, Reasons, point 2).

2.4 The appellant filed a certified translation of the underlying description with the statement of grounds of appeal. In this corrected translation, "local terminal" has been replaced with "first network entity" (see, for example, paragraphs [0010], [0022] and [0036]). For this amendment, the explanation has been given that the corresponding Chinese wording is a pronoun. This explanation is in line with the fact that, in the concerned sentences, a "first network entity" is indeed mentioned before the word "local terminal" (ibid.).

2.5 The board further notes that in the description according to both the originally filed translation and the corrected translation, at the beginning of the summary (paragraph [0007]), two communication parties are mentioned. Also in the following parts of the description two communication parties are mentioned (paragraphs [0036] and [0084]). It is therefore unlikely that the term "local terminal" was meant to refer to a third communication party.

The board is therefore satisfied that the appellant provided the necessary evidence that the correct translation of the term in question is "first network entity" (i.e. the MGC unit) and that claim 1 as granted does not contain added subject-matter. Hence, claim 1 of the main request complies with Articles 100(c) and 123(2) EPC.

2.6 The Opposition Division argued in point 14.2.4 of the decision under appeal that paragraph [0047] referred to three network entities. However, this argument became moot for the corrected translation.

3. Remittal to the Opposition Division (Article 111(1) EPC)

3.1 In view of the above, the sole ground for the revocation of the opposed patent is considered to be unfounded. Consequently, the decision under appeal is to be set aside.

3.2 Given that the compliance of the patent with the requirements of novelty and inventive step was neither discussed nor decided in the appealed decision, a ruling on those issues by the board for the very first time in these appeal proceedings could not be given without an undue burden and would run contrary to the very purpose of a judicial review within the meaning of Article 12(2) RPBA 2020. The board thus considers that the above observations represent "special reasons" within the meaning of Article 11 RPBA 2020 for remittal of the case.

3.3 Accordingly, the board remits the case to the Opposition Division for further prosecution on the basis of the main request (Article 111(1) EPC).

4. Reimbursement of the appeal fee (Rule 103(1)(a) EPC)

4.1 The appellant requested the reimbursement of the appeal fee on the grounds that the composition of the Opposition Division had changed after a communication setting out their preliminary opinion had been issued and that this was contrary to Article 19(2) EPC and thus violated the appellant's right to be heard.

4.2 The board takes from the file that the change in the composition of the Opposition Division, however, occurred before the oral proceedings before the division. The composition of the Opposition Division did not change after those oral proceedings until the decision was issued. The change at this early stage, i.e. before holding oral proceedings before the Opposition Division, does not per se constitute a procedural violation which could justify the reimbursement of the appeal fee (see e.g. T 1652/08, Reasons, point 2).

4.3 Therefore, the request for reimbursement of the appeal fee is to be refused.