问题：

[多选] Which two statements are true about the protocols that are used for transmitting voice traffic？（）

A . RTP multiplexing is used to keep multiple phone conversations separate
B . RTP provides end-to-end delivery services for voice traffic.
C . UDP is used to ensure a reliable transmission from sender to receiver.
D . RTP is used to provide resource reservation for the voice stream.
E . UDP provides multiplexing of multiple phone conversations.