Quality of Service

The Quality of Service (QoS) features mentioned in this section apply only to the Customer’s LAN and private WAN (i.e. MPLS) networks. Internet service providers do not apply or use any QoS features.

Voice, as a class of IP network traffic, has strict requirements concerning packet loss, delay, and delay variation (also known as jitter) to maintain high voice quality. To meet voice traffic requirements, many vendor solutions include the following QoS features:

• Traffic classification

• Queuing

• Traffic shaping

• Compressed Real-Time Transport Protocol (CRTP) *

• Transmission Control Protocol (TCP) header compression *

 46 Labs monitors and appropriately sizes the connections to the 46 Labs datacenters to prevent oversubscription. However for private connections, for example in MPLS networks, the Provider Edge (PE) to Customer Edge (CE) MPLS connections are a common place where oversubscription can occur. The proper QoS configuration of the PE and CE routers is often the most important consideration in maintaining high voice quality on MPLS networks.

The Peeredge Orchestrator follow the industry best practice design approach and marks all SIP signaling traffic with a Differentiated Services Code Point (DSCP) marking of 24 (PHB CS3) and all RTP/SRTP traffic with a DSCP marking of 46 (PHB EF).