How do I know the ATA's IP address?
Will I be able to talk if I can connect to another ATA?
You can find out the ATA's IP address by dialing some DTMF code, specific to the ATA manufacturer, from an attached
phone. The ATA will then read the IP address to you audibly, along with the subnet mask and default gateway information -- typically obtained through DHCP.
If there is no SIP server or service provider, and you want to call from one analog phone to another phone on a separate ATA, you can typically disable registration on the ATA and have it send all calls to a specified IP address. This requires setting up fixed IP addresses on each ATA.
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