Problem with connection after change network provider

Hello everyone.
I have got a question about some issue i have notice in this application.
My company is using Jitsi to contact with external customer. A coupe months ago we installed second (backup) network connection. Right now I have two network providers (Orange and T-mobile). Router is configured that way for example: if orange network goes down then T-mobile is working and vice versa. The main problem is that when Jitsi is turning on and router will switch from Orange to T-mobile then jitsi is losing session or something like that and I have to restar application because if i will not do that no one will hearing me.
Is there any option to avoid situation like that?