The applicant claims color as a feature of the mark, namely, Blue color for the 'n' letter and black color for other letters.
The mark consists of The "pbx" part is used as acronym for "private branch exchange", the "sip" part is used as acronym for "session initiation protocol". The "n" letter between "pbx" and "sip" is a short form of "and" or "in", which links the two acronyms.