---
title: QoS within Nile Service Block
slug: qos-within-nile-service-block
docTags: 
createdAt: 2025-01-23T08:41:49.902Z
---

## Objectives

- **Enhance User Experience:** Deliver high-quality user experience by prioritizing voice, video, and critical business applications.
- **Simplify QoS Requirements:** Promote architectural simplicity through a zero-configuration model.
- **Enable Wireless QoS:** Utilize 802.11e WMM and EDCA to ensure efficient wireless QoS.
- **Preserve QoS Across Networks:** Maintain end-to-end QoS standards across the Nile Service Block (NSB) network.

## Capabilities Outline

### Support for Multiple Priorities and Classes

Traffic can be classified into four priority categories:

1. Network Control and Voice
2. Video and Business Premium/Critical
3. Background
4. Best Effort / Low Priority

These categories are mapped to WMM 802.11e Access Classes and aligned with conventional switch/router service tiers (for example, Platinum, Gold, Silver, Bronze).

### DSCP-Based Classification and Re-Marking

- Supports classification and re-marking of DSCP values based on Deep Packet Inspection (DPI).
- Trusted applications such as Wi-Fi Calling, Zoom, Webex, and Teams adhere to DSCP-trust principles.
- If incoming traffic is marked with lower DSCP values than DPI-provided thresholds, re-marking is applied in both upstream and downstream directions.

### Traffic Processor and Classifier

- Implements traffic buffering mechanisms.
- Supports multiple priority levels and Class-Based Weighted Fair Queuing (CBWFQ).
- Allocates queue weights dynamically on a profile basis.

# DPI and Application Prioritization

The Nile Service Block (NSB) integrates a Deep Packet Inspection (DPI) engine to identify and prioritize latency-sensitive applications.

### Traffic Identification

DPI inspects packet headers and payloads to classify traffic into protocol families such as:

- **FAMILY\_AUDIO\_VIDEO:** Applications including Zoom, Webex, and Teams
- **FAMILY\_AUTHENTICATION**
- **FAMILY\_MICROSOFT\_OFFICE**
- Additional well-known protocol groups

### Dynamic Re-Marking

DPI assigns DSCP values to traffic based on protocol family and criticality. If traffic enters the NSB with lower DSCP markings, it is re-marked according to DPI guidance. Examples include:

- **Voice traffic:** DSCP 48, priority weight 30%
- **Video traffic:** DSCP 34, priority weight 10%
- **Best Effort / Background traffic:** Lower-priority DSCP values

### Application Awareness

Ensures real-time and business-critical applications, such as voice calls and video conferencing, consistently receive priority handling across the network

::Image[]{src="https://api.archbee.com/api/optimize/6swSwg1BT-BlfEPtYJhxM/FxN3fUrjk-uNCOrOehJOQ_image.png" size="34" width="960" height="540" position="center" showCaption="false"}

### Wi-Fi Calling

Wi-Fi Calling differs from other voice protocols because it uses an IPSec-based connection to send voice traffic from a mobile device to the carrier’s **Evolved Packet Data Gateway (ePDG)**.

:::BlockQuote
**Note:** The ePDG is a core network component that connects Wi-Fi networks to mobile networks, enabling Voice over Wi-Fi (VoWiFi) services such as phone and video calls over Wi-Fi.
:::

Nile maintains a predefined set of known ePDGs for global carriers to correctly identify Wi-Fi Calling flows and assign the appropriate voice priority when traffic traverses the NSB. Nile also collaborates with customers in different regions to add carrier-specific ePDGs as needed.

# Guest Traffic

All guest traffic is forwarded through the Nile Service Block as **Best Effort**.