Agents shown as busy using agent status application

The status of the agents in my system are continuously shown as BUSY with agent status application.Can anyone tell me what are the things that may lead to this?

I am using Asterisk 13.6.0.

AgentRequest() shows agent status as BUSY continuously.

Before investigating this I’d suggest upgrading to the latest version of 13 as 13.6.0 is over 3 years old, and chasing problems that have already been solved is a waste of time. If the problem still occurs you’ll need to provide the configuration and console output.

Thank You, will try it