Just understand what will happen when you reverse the flow. The 01234411226 number will be dialed and when they answer it will then call PJSIP/20 so with that flow that means the callee (01234411226) will answer the call and then immediately hear ringing/wait for the person at PJSIP/20 to take the call.
Understand that voicemail is an answered call so if you call the user and their voicemail answers, it’s going to then call PJSIP/20 and they are going to answer to either get the tail end of the voicemail greeting or end up in a voicemail box and not realize it.
So reversing the flow means 1) The callee could answer and it be a person or a voicemail greeting. Without additional checks/steps you won’t know. 2) The callee will have to sit on the call while it connects back to the agent. 3) You have a retries set to 1 minute. If the original call is not answered and retried again in a minute, will the agent a) know that and b) be available for the call