A retail company connects its 250 branches across the globe to the core using MPLS Layer 3 VPN. The company is planning to migrate its traditional telephony services to VoIp, in order to reduce the co

Jitter - variation in end-to-end packet delay - directly degrades voice quality because the receiver's playout buffer cannot compensate for large delay variations, resulting in choppy or distorted audio across international MPLS paths.

Call routing design is an important implementation planning task but is an application-layer concern, not a primary network transport concern introduced by the MPLS migration itself.

SRST is a failover feature that enables local call processing during WAN outages - it is a design option to evaluate but is not a primary concern of the migration to VoIP.

MTU mismatches can cause MPLS label stack fragmentation, but this is a secondary and easily remediated concern compared to jitter and bandwidth, which directly and continuously affect voice quality.

Sufficient available bandwidth must be provisioned for all simultaneous VoIP calls using the selected codec (such as G.711 at 64 kbps or G.729 at 8 kbps per call), as insufficient bandwidth causes packet loss and call quality degradation across all 250 branch connections.