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International application No. Applicant's or agent's file reference
PCT/US2019/062369 TM2-0643PCT
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
20 November 2019 04 December 2018
FOR FURTHER ACTION: See Form PCT/ISA/220 as well as, where applicable, item 5 below.
This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.
It is also accompanied by a copy of each prior art document cited in this report.
1. Basis of the report
a. With regard to the language, the international search was carried out on the basis of:
the international application in the language in which it was filed.
a translation of the international application into                                          which is the language of a translation furnished for the purposes of international search (Rules 12.3(a) and 23.1(b)).
This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6bis(a)).
With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search was carried out on the basis of a sequence listing:
2. Certain claims were found unsearchable
3. Unity of invention is lacking
4. Title of the invention
The text is approved as submitted by the applicant.
The text has been established by this Authority to read as follows:
5. Abstract
The text is approved as submitted by the applicant.
The text has been established, according to Rule 38.2, by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority.
6. Drawings
The figure of the drawings to be published with the abstract is Figure No.     3    
as suggested by the applicant.
as selected by this Authority, because the applicant failed to suggest a figure.
as selected by this Authority, because this figure better characterizes the invention.
none of the figures is to be published with the abstract.


     H04L 29/06 (2006.01)i
According to International Patent Classification (IPC) or to both national classification and IPC


Minimum documentation searched (classification system followed by classification symbols):
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Korean utility models and applications for utility models
Japanese utility models and applications for utility models
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
eKOMPASS(KIPO internal) & Keywords: conference call, switch, server, session


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
US 06018360 A US 6018360 A (RANDALL R. STEWART et al.) 25 January 2000 column 3, line 40 - column 6, line 8; and claims 1-12
US 2012-0294436 A1 (SUNYOUNG PART et al.) 22 November 2012 paragraphs [0032]-[0045]; and claims 1-7
US 2010-0061539 A1 (MICHAEL ERIC CLORAN et al.) 11 March 2010 paragraphs [0027]-[0035]; and claims 1-7
US 2007-0268891 A1 (ALEXANDER SCHUKAT et al.) 22 November 2007 paragraphs [0031], [0044]-[0055]; and claims 1-13
US 8300790 B2 (JOHN F BUFORD et al.) 30 October 2012 column 10, lines 4-22; and claims 1-6
Special categories of cited documents:
document defining the general state of the art which is not considered to be of particular relevance
document cited by the applicant in the international application
earlier application or patent but published on or after the international filing date
document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)
document referring to an oral disclosure, use, exhibition or other means
document published prior to the international filing date but later than the priority date claimed
later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention
document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone
document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art
document member of the same patent family


Patent document cited in search report Publication date
Patent family member(s) Publication date
US 06018360 A
25 January 2000
EP 1112657 A1
JP 2002-524983 A
KR 10-0426763 B1
WO 00-014964 A1
04 July 2001
06 August 2002
13 April 2004
16 March 2000
US 2012-0294436 A1
22 November 2012
EP 2525556 A2
EP 2525556 B1
EP 2525556 A3
KR 10-2012-0127987 A
21 November 2012
25 March 2015
26 March 2014
26 November 2012
US 2010-0061539 A1
11 March 2010
AU 2004-237227 B2
AU 2004-237227 A1
CA 2524591 A1
EP 1620777 A2
NZ 543885 A
US 2014-0112460 A1
US 2013-0297496 A1
US 2013-0096924 A1
US 7606718 B2
US 8223944 B2
US 8332231 B2
US 8484042 B2
US 8626520 B2
US 9710819 B2
US 2005-0002502 A1
US 2010-0061529 A1
US 2010-0063815 A1
WO 2004-099934 A2
WO 2004-099934 A3
14 July 2011
18 November 2004
18 November 2004
01 February 2006
25 September 2009
24 April 2014
07 November 2013
18 April 2013
20 October 2009
17 July 2012
11 December 2012
09 July 2013
07 January 2014
18 July 2017
06 January 2005
11 March 2010
11 March 2010
18 November 2004
09 April 2009
US 2007-0268891 A1
22 November 2007
AT 524909 T
EP 1858218 A1
EP 1858218 B1
US 8730944 B2
15 September 2011
21 November 2007
14 September 2011
20 May 2014
US 8300790 B2
30 October 2012
DE 102011119387 B4
DE 102011119387 A1
GB 2488859 B
GB 2488859 A
US 2012-0163577 A1
16 July 2015
28 June 2012
17 May 2017
12 September 2012
28 June 2012
Name and mailing address of the ISA/:
Korean Intellectual Property Office
189 Cheongsa-ro, Seo-gu, Daejeon Metropolitan City, 302-701
Republic of Korea
Facsimile No. +82-42-481-8578
Date of the actual completion of the international search:
09 March 2020
Date of mailing of the international search report:
09 March 2020
Authorized officer:
KIM, Sung Hee
Telephone No. +82-42-481-3516
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