Two IP Addresses And A SIP Trunk

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we have a failover redundancy with two ISPs and an outside SIP Trunk provider for the telephony. Since network failures of our primary ISP
line happen sometimes I would be interested into a solution where we could use both IPs to connect to our telephony provider. I was talking to them and they said they need to have our IP entered into their system and that it must be only one IP. Therefore when there is a failure on our primary ISP, I can call them and they change the IP to our secondary IP – but this takes time and our phones don’t work in the meantime.

Could this be done automatically and if, how? We have two static IPs.

Thanks a lot. Matej

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