A multinational enterprise company has many branches in the Americas, Europe, and Asia Pacific with headquarters in London. Branch offices use Ethernet (bandwidth range from 1 Mb/s to 10 Mb/s) as…

A jitter buffer holds incoming RTP packets and releases them at a steady, controlled rate, effectively masking the timing variation caused by network jitter. Without a playout buffer, out-of-order or delayed packets cause audible gaps and distortion in VoIP. This is the direct, purpose-built mechanism for jitter compensation at the receiving endpoint.

Call Admission Control limits the number of active calls to protect bandwidth, but it does not smooth out packet arrival time variation for calls already in progress.

Increasing link bandwidth reduces congestion and can lower average delay, but it does not eliminate jitter because variable queuing delays can still occur even on uncongested links.

WRED is a congestion avoidance mechanism that proactively drops lower-priority packets to prevent queue buildup, but it does not buffer or reorder packets to compensate for jitter at the endpoint.