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[LTE_207] Exploring IMS/VoLTE Networks

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VoLTE (Voice over LTE) is the preferred solution for delivering voice over LTE networks, based on the IP Multimedia Subsystem (IMS) architecture. This course is designed to present IMS/VoLTE architecture and call flow scenarios from the perspective of a typical wireless operator. The course starts with a detailed look at the end-to-end IMS core architecture in a wireless operator’s typical VoLTE network then steps through the various stages of interactions of User Equipment (UE) and LTE Radio, EPC and IMS network elements. Discussions cover initial IMS/VoLTE registration, covers the details of key service scenario such as IMS registration, VoLTE to VoLTE call setup and VoLTE to PSTN/3G call setup. The role of key nodes during call setup such as ENUM and TAS is covered. Finally, the topics of VoLTE KPIs and impact to the UE, RAN and core networks are covered for VoLTE deployment.

Learning Objectives

After completing this course, the participant will be able to:
• Sketch VoLTE architecture and describe the functions supported by each VoLTE network component
• Identify key interfaces and related protocols such as SIP, Diameter, RTP, H.248
• Step through the key VoLTE operations:
­ IMS registration
­ VoLTE to VoLTE call setup
­ New bearer setup for VoLTE QoS
­ VoLTE interworking with PSTN/3G
• Sketch an end-to-end signaling and traffic paths for VoLTE
• Describe how QoS is enforced in LTE network for VoLTE
• List the quality and capacity related KPIs for monitoring of VoLTE operations

Intended Audience

This course is intended for those seeking technical details of a typical VoLTE network architecture and its operations.

Suggested Prerequisites

• [LTE_112] VoLTE Overview (eLearning)

Course Length

2 Days Instructor Led

Course Outlines / Knowledge Knuggets

1. VoLTE Overview
1.1. What is VoLTE?
1.2. Role of LTE and IMS for VoLTE
1.3. Voice and video features
1.4. Enhancements for VoLTE

2. VoLTE in LTE Networks
2.1. VoLTE IMS architecture
2.2. VoLTE call model
2.3. Role of CSCFs
2.4. Role of DRA and SLF

3. Registration in VoLTE
3.1. Default bearer connectivity to IMS
3.2. P-CSCF discovery
3.3. SIP, SDP, Diameter, H.248, RTP
3.4. Private and public user identities
3.5. User registration
3.6. App servers such as TAS, PS, SCG
3.7. Registrations with app servers
3.8. Exercise: End-to-end message ladder diagram of VoLTE registration

4. VoLTE Call Setup
4.1. End-to-end VoLTE to VoLTE call setup
4.2. ENUM and TAS during VoLTE call setup
4.3. VoLTE call release
4.4. Exercise: End-to-end message ladder diagram of VoLTE to VoLTE call

5. QoS for VoLTE Calls
5.1. P-CSCF, PCRF, and P-GW for QoS enforcement
5.2. Dedicated bearer setup
5.3. QoS enforcement and scheduling
5.4. Dedicated bearer release

6. VoLTE Interworking Calls
6.1. ENUM for PSTN/3G call setup
6.3. Signaling and traffic paths
6.4. Exercise: End-to-end message ladder diagram of VoLTE to Non-VoLTE call

7. VoLTE Deployment
7.1. New network nodes for VoLTE in MTSO
7.2. eNB, S-GW, P-GW enhancements
7.3. Device impact
7.4. VoLTE KPIs


- Self-paced, animated, and interactive

- $150/each course for 6 month license

- Immediate online access upon purchase

- Flexible way to take training at any hour

- Online training transcript available

- Electronic certificates at completion

- Full list of courses at


For any additional questions,
please contact Mr. Rod Marckese
at +1-972-664-0727 x246 or

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