LTE Voice - CS Fallback

1 Days / 2 Live Online Sessions (0900-1230) / Technical Level: Level 3

Course Code: LT1002CS

Course Summary

This course provides a detailed technical description of the use of CS fallback to deliver an LTE voice service.

Who would benefit

This course is suitable for engineering and technical management staff who require a technical description of the options that exist in LTE for delivering voice and other real-time traffic types by means of CS fallback.


Attendance on this course assumes previous attendance on the LTE Engineering Overview course (LT3600) or equivalent basic LTE knowledge (although a recap of basic LTE architecture and concepts is provided at the start of the course) and also assumes a working knowledge of IP.

Topic Areas Include

  • Technical overview of LTE

  • Introduction to the options for LTE voice

  • CS fallback architecture

  • SGs Application Protocol (SGsAP)

  • Combined attach procedure

  • Alignment of tracking and location areas

  • CS fallback call setup options

  • Mobile-originated and mobile-terminated call setup procedures

  • Roaming retry and roaming forwarding

  • Delivery of SMS messages over the SGs interface