Why is my IMS Status Not registered?

Causes of Not Registered on Network Error There could be an issue with your SIM card, or the problem could be on your carrier’s end. Possible causes of the ‘not registered on network’ error include: Your phone’s firmware or operating system is out of date. The SIM card is disconnected or damaged.

What is IMS registration?

It indicates whether you have VoLTE service is active or not. Basically 4G (LTE) is designed to achieve more data speed.

What is 3rd party registration in IMS?

The purpose of the third party registration is to let the application servers know that the user is available in the network (e.g. TAS will stop with Call Forwarding towards Voice Mail) and to create an AS Association. AS Association is a binding between the S-CSCF and (primary) Application Server.

What is nonce in IMS registration?

nonce is a parameter, which is populated with the Base64 encoding of the concatenation of the AKA authentication challenge RAND, the AKA AUTN token, and optionally some server specific data, as in following diagram from RFC 3310 Figure 1. Base64 Encoding is based on following table defined in RFC 2045 6.8.

How do I enable IMS status?

Steps to Reproduce

Open network settings, notice no VoLTE options available.
Open Phone app.
Dial ##4636##
Select Phone Information.
Notice VoLTE-related options are toggled off and grayed out.
Tap 3 dots in top right corner and select IMS service information.

How do I open IMS settings?

Dial *#*#467#*#* to open IMS Settings. Tap on “IMS Service Switch”.

How do I fix my IMS registration status?

On your device, navigate to Settings > Backup & Reset > Reset Network Settings. Once done, restart the phone. You may need to re-enter your Wi-Fi password to connect to Wi-Fi. Also try removing and reinserting your SIM card, as this will force your device to reestablish a connection to our towers.

How do I turn off IMS service?

This can be done by going to Settings > Apps > find Messaging on the list > Storage > Clear Cache.

What is implicit registration in IMS?

An implicit registration set is a group of public user identities that are registered via a single registration request. When one of the public user identities within the set is registered, all public user identities associated with the implicit registration set are registered at the same time.

What is IMS call flow?

The calling IMS subscriber is currently roaming outside the home network. The called user is registered in the home network. The caller and the called user require resource reservation before the call can be setup.

What is Mar in IMS?

S-CSCF send MAR (Multimedia Authentication Request) to HSS. (9) : Multimedia Authentication Response (Path : HSS –> S-CSCF) HSS sends MAA (Multimedia Authentication Answer) to S-CSCF with the following information.

How does an unauthenticated IMS registration take place?

Terminal activates a PDP context. An unauthenticated IMS registration is attempted. IPSec security association is established between the User terminal and the P-CSCF. Finally the terminal performs an IPSec protected registration that completes the authentication of the network and the terminal.

How does IMS registration of a terminal work?

This sequence diagram describes the IMS Registration of a terminal. The IMS registration goes through the following sequence: (1) GPRS Attach: The terminal registers to the GPRS Network. (2) PDP Context Activation: An IP address is assigned to the terminal.

How is IPsec protected registration established in IMS?

IPSec security association is established between the User terminal and the P-CSCF. Finally the terminal performs an IPSec protected registration that completes the authentication of the network and the terminal. We look at the registration via multiple views into the registration interactions:

Is the IMS subscriber registered in the home network?