VoLTE Call Flow and Procedures
VoLTE Call Flow and Procedures is the LTE voice-reference hub for IMS registration, call setup, call release, supplementary-service updates, emergency service, and continuity handling.
This page points to the full LTE-style procedure pages so engineers can move quickly from an overview into the exact signaling branch they need.
Core VoLTE Procedures
| Procedure | When to use it |
|---|---|
| VoLTE Registration | Use when validating IMS registration readiness over LTE. |
| VoLTE Mobile Originated Call | Use when the UE starts a new LTE voice call. |
| VoLTE Mobile Terminated Call | Use when the network delivers an incoming LTE voice call. |
| VoLTE Call Release | Use when analyzing BYE, 200 OK, and media teardown. |
| VoLTE Call Hold / Resume | Use when analyzing re-INVITE, SDP direction, and media-state changes. |
| VoLTE Emergency Call | Use when emergency IMS routing and LTE emergency-service handling are involved. |
Continuity and Related Voice Pages
- SRVCC Procedure for voice continuity during movement between packet voice and circuit-switched service.
- Dedicated Bearer Setup for VoLTE for QoS and bearer treatment behind LTE voice service.
- 5G VoLTE Fallback / Voice Continuity Comparison for mixed 5G and LTE voice environments.
How to Read the Family
- Start with VoLTE Registration if the problem is basic voice readiness.
- Move to mobile originated or mobile terminated setup once IMS registration is stable.
- Use call release or hold and resume for in-dialog service behavior.
- Switch to SRVCC when the active voice path changes during mobility.