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Registering serveral 7940 IP Phones with 3CX

I am trying to register serveral 7940 Phones with the 3CX phone system. When the phones are on different networks to each other they register and work as expected. However, when the phones are on the same network only one will register. It is not phone or extension specific as different phones register.

The phones are using NAT and will not register without this.

It had been suggested that the action tag should be set to none, this is done but has no effect.

Any help or ideas greatly appreciated.

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