No need to apologies as you clearly stated that you were trying to migrate from Elastix to IssabelI in your original post!
I don't have any first hand experience when it comes to IssabelI but a quick Google search returned the following result: How to Perform Full Migration from Elastix to Issabel
Starts off with:
If you try to migrate from Elastix to Issabel, you will face a lot of issues. These problems are inevitable but fortunately, you can fix them. In the guide below, I will explain how I performed the migration while keeping all data and successfully transferring all configurations.
If you try to migrate from Elastix to Issabel, you may face a number of problems. Some of these are listed below:
- In the migration process, you may see failure logs in different steps; especially Asterisk database.
- After migration, you may face permissions errors.
- If you are using 3rd party add-ons, you may lose some data or face login problems.
- After migration, you will most likely face problems in SIP and Trunks registration.
These problems are inevitable but fortunately, you can fix them.
It's hard to say for sure without looking at the server logs but it's likely just a permission error. You say the issue is with the IVR but are you sure that your trunks are registering ok?
and see if that fixes it.