A.IP phone extensions for teleworkers must be chosen carefully so not to duplicate campus phone extensions.
B.More security exposure exists due to lack of support for Intrusion Detection System and URL filtering for teleworker originated traffic.
C.Compressed RTP and IPSec are not compatible and result in no bandwidth savings.
D.Broadband modems must support Quality of Service for adequate voice quality.

A.Use hash MD5 to ensure that IKE works through NAT. 
B.Use ah-sha-hmac, as it does not check the integrity of the IP header. The IP header will change due to NAT. 
C.Use 3DES, as it will encrypt the IPSec header IP addresses and bypass addressing issues. 
D.Use esp-sha-hmac, as it does not check the integrity of the IP header. The IP header will change due to NAT.