Core Issue
Low Latency Queueing (LLQ) is the key prioritization technique for enabling voice and data integration.
Resolution
To configure Low Latency Queueing (LLQ), perform these steps:
- Create a class map for Voice over IP (VoIP) traffic, and define a match criteria.
- Create a class map for VoIP signaling, and define a match criteria (optional).
- Create a policy map, and associate it to the VoIP class maps.
- Enable LLQ by applying the policy map to the outbound WAN interface.
These documents provide useful information on Configuring Class-Based Weighted Fair Queuing (CBWFQ) and LLQ. They also provide a number of other good sources on configuring Quality of Service (QoS) for voice: