[多选] What are the DSL-specific factors that require additional bandwidth when supporting Voice-over-IP over an IPSec VPN?（）

A . A voice packet is sent via multiple fixed-length cells; a portion of the last cell is padding, requiring more bandwidth.
B . ADSL typically uses PPPoE encapsulation, which adds additional overhead to each voice packet.
C . A voice packet is sent via multiple fixed-length cells; each cell has about 10% Layer-2 header overhead.
D . IPSec requires additional overhead for the header and hash.
E . ADSL carrier band requires additional bits to be carried over the wire to the DSL Access Concentrator.

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[多选] What are the DSL-specific factors that require additional bandwidth when supporting Voice-over-IP over an IPSec VPN?（）

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