What is the recommended DSCP name for the telephony (VoIP) service class according to the appropriate RFCs?
A) EF
B) AF41
C) DF
D) CS4
E) AF31
The Answer is A) EF
Issue
What DSCP name and value are recommended for VoIP traffic?
Solution
RFC 4594 recommends the Telephony service class use DSCP name EF (Expedited Forwarding). This has a DSCP marking of 101110. Devices should be configured to prioritize traffic with this marking in a low latency queue and should never drop this traffic selectively.
More
(A) RFC 4594
(A) Classifying VoIP Signaling and Media with DSCP for QoS