I have a client with 23 phones, all of them Grandstream 2170s. Connected to the 3CX cloud based system. Using the most recently updated version 16. SIP ALG is turned off in both the router and modem. Tried letting the phones connect with STUN without using the SBC, tried using the SBC, and now have each phone back on STUN, but each phone has its own port to itself (5066 through 5089, so no conflict with 5060, 5065 or 5090).
In all of the above cases, each day, a random phone or two will unregister. it's not always the same phones. Sometimes the phone itself will say it's not registered, sometimes the phone will show that it is registered, but it actually isn't, as it doesn't appear in the "Phones" page on the management console. Rebooting the phone will register it again, no problem. But since my client has to reboot a phone or two each day, he's starting to believe the system is unreliable.
Something must be wonky in the network, but I cant figure out what. Any good idea's out there about what the problem is? I'm starting to pull my hair out.
In all of the above cases, each day, a random phone or two will unregister. it's not always the same phones. Sometimes the phone itself will say it's not registered, sometimes the phone will show that it is registered, but it actually isn't, as it doesn't appear in the "Phones" page on the management console. Rebooting the phone will register it again, no problem. But since my client has to reboot a phone or two each day, he's starting to believe the system is unreliable.
Something must be wonky in the network, but I cant figure out what. Any good idea's out there about what the problem is? I'm starting to pull my hair out.
