I am having an issue with Dahua doorbell in VTO and dual VTH setup.
It was already set up and working, until I decided I wanted to upgrade to the latest firmware, because I was bored ( I know, upgrading something with no reason while it is working, it is asking for trouble, and I got trouble)
After the upgrade, the one VTH stopped registering to the VTO. I reset to factory and set up the system again, I messed around with all the settings and finally got it registering to the VTO and SIP server.
Now each VTH can call each other, and each can call the main VTO. However, when the VTO calls the villa number 9901 (doorbell button pushed), the VTHs do not ring. If the VTO calls the VTHs individually at 9901#0 or 9901#1 then it works fine for each VTH.
So I cannot get both the VTH to ring when dialing 9901. Below are all my settings.
Am I missing something? Any ideas?

VDPConfig

VTO Local setting

VTO No

Room Numbers

Status
It was already set up and working, until I decided I wanted to upgrade to the latest firmware, because I was bored ( I know, upgrading something with no reason while it is working, it is asking for trouble, and I got trouble)
After the upgrade, the one VTH stopped registering to the VTO. I reset to factory and set up the system again, I messed around with all the settings and finally got it registering to the VTO and SIP server.
Now each VTH can call each other, and each can call the main VTO. However, when the VTO calls the villa number 9901 (doorbell button pushed), the VTHs do not ring. If the VTO calls the VTHs individually at 9901#0 or 9901#1 then it works fine for each VTH.
So I cannot get both the VTH to ring when dialing 9901. Below are all my settings.
Am I missing something? Any ideas?

VDPConfig

VTO Local setting

VTO No

Room Numbers

Status