Asterisk 18.17.1 Unreachable

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I have 4 devices that I connect here local and there is no issue. I have those same 4 devices connecting from another location across the internet.

They all boot up, connect and register I can send audio to them and they play.
– then at times they show UNREACHABLE and I can no longer send audio. then they come back online again and are OK.

I’m using old chan_sip, I tried changing qualify to no – that did not help.

What might I adjust to keep these SIP units alway ON ?

Thanks

Jerry

One thought on - Asterisk 18.17.1 Unreachable

  • 1. qualify makes no difference – that’s just a question of whether Asterisk checks whether things are still connected or not. It doesn’t make them connect (or not) any differently.

    2. check the routers that these devices are connected through and see if you can increase the UDP connection tracking timeout. If a device (phone) doesn’t send a packet within this time, the router will forget the NAT association between the (private IP-addressed) phone and Asterisk (out on a public IP
    address), and that means that when Asterisk sends an Invite to the phone, the router fails to send it on to the phone, so the phone doesn’t know about it.
    Only when the phone then re-registers, does the router then refresh its connection tracking timeout, and all is well again (for a while).

    3. Reduce the re-register interval on the phones, so that they refresh the connection tracking timeout on the router more frequently than it forgets.

    Antony.

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