Issue with NAT extension which has 2 possible IPs

@SkyKing wrote:

Hi all, i hope you are all doing well.

I hope that topic title makes sense

I'm having the following issue.

I have a SNOM phone connected behind a router that has 2 SIM cards in it , if one fails it switches to the other. From the router the SNOM phone registers as an extension on my FreePBX . that works fine no issue, however when / or if i switch the sims and thus change the IP the phone comes from it doesn't register i can make from the phone but incoming calls don't work.

When i look in sip show peers its shows the extension as UNKNOWN. if i wait about 30 minutes it registers on the new IP and everything works again. Sometimes if i run conntrack -D on the router it will reconnect in 10 minutes but mostly it takes 30 minutes. is there any way to fix this or could someone point me to where i can tweak the timeout settings for the extension, or in general where to look to resolve this. I'm at a bit of a loss as i don't know where to start to isolate the issue.

thanks for any and all assistance

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