vCard: A format for storing and exchanging electronic business cards, as described in [RFC2426].
version sequence number (VSN): A 64-bit unsigned number. Version sequence numbers are assigned to global version sequence numbers as part of file metadata in monotonic increasing order.
virtual private networking (VPN): A private data network that makes use of the public telecommunication infrastructure.
voice burst: Individual speech frames are grouped together into voice bursts. A voice burst contains a set of speech frames during which the timing is preserved by receiving clients. Gaps in the voice burst will be filled with silence to preserve the timing of the received packets. Timing is not guaranteed to be preserved between voice bursts. For more information about voice bursts, see section 1.3.1.
voice message: A Message object that contains audio content recorded by a calling party.
Voice over IP (VoIP): The use of the Internet Protocol (IP) for transmitting voice communications. VoIP delivers digitized audio in packet form and can be used to transmit over intranets, extranets, and the Internet.
volume: A group of one or more partitions that forms a logical region of storage and the basis for a file system. A volume is an area on a storage device that is managed by the file system as a discrete logical storage unit. A partition contains at least one volume, and a volume can exist on one or more partitions.
volume sequence number (VSN) (for file replication service): A unique sequence number assigned to a change order to order the event sequence in a replica. It is a monotonically increasing sequence number assigned to each change that originates on a given replica member. If one change order has a smaller volume sequence number (VSN) than another change order, the change that the first change order represents occurs before the change that the second change order represents.