VoLTE Dropping Calls in Ericsson? Problem with Handset or Network?

4G LTE
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Hi everyone,

I’m currently facing issues with VoLTE drop calls and VoLTE access failures on an Ericsson network, and I’m trying to understand the best ways to troubleshoot and improve the situation.

Has anyone experienced similar problems? I would appreciate guidance on areas such as:

  • Key KPIs to check for VoLTE stability
  • Parameter tuning in Ericsson for VoLTE accessibility and retainability
  • Possible issues with IMS, SIP signaling, or SRVCC
  • Radio conditions (coverage, interference, congestion) that could affect VoLTE performance
  • Any recommended Ericsson counters or traces to analyze
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VoLTE–VoWiFi handover: Which MME events can help identify the cause of drop calls?

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Hi Tao,

Before trying to go for high end technical stuff my approach will be as follows for these type of issues.

  1. How do you got to know there are Volte Call drops and those are access network faliures?Is there any customer complaints?Are those related to specific region?Specific technology 3G 4G 5G?If it is came from customer care then they should have those info and there should be an incident open related to it as well.This s very important since a call drop can be articulated by thousands of ways.

  2. After gathering thoe preliminary info you can have a calculated gueses which area it could be.I will give you some simple things you can determine from thoses informations.You can check if it is a MO call faliure or MT call faluire or both.Then you can determine it is related to specific network like 3G network 4G network callls only etc.Then you can check wether it is common to specific area and if that is the case check its Tx link degreadation etc.

  3. Then only you can decided which KPIs which dashboards we need to observe to get further more info.(I dont recommend checking node level counters by running command because if that node having an issue running commands to get the measurement will course further trouble.)

  4. Then you need to identify the re productibility of the issue.Either in production or Lab environment.

  5. If we can then reproduce it with all the specific logs eabled to find the route course.

  6. Develop the fix.

This is how I used to troubleshoot these issues in the past ,present and future as well since it worked all the time.There are more than thousands of ways a call can get dropped including the handset and just randomly following a predetermined reason might take you further away from the real issue if there is one which is faced by the customer

Thank you

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