What are the DSL-specific factors that require additional bandwidth when supporting Voice-over-IP over an IPSec VPN?（）
- AA voice packet is sent via multiple fixed-length cells; a portion of the last cell is padding, requiring more bandwidth.
- BADSL typically uses PPPoE encapsulation, which adds additional overhead to each voice packet.
- CA voice packet is sent via multiple fixed-length cells; each cell has about 10% Layer-2 header overhead.
- DIPSec requires additional overhead for the header and hash.
- EADSL carrier band requires additional bits to be carried over the wire to the DSL Access Concentrator.