Last week I had to diagnose a VoIP problem for a client wherein an intercom which acted as a regular POTS “phone” was connected to their IP-based PBX. The intermediary was a small box called an Analog Telephone Adapter. The Viking model number appears to be ATA-100 while the actual Cortelco model is 8211 or 821121-ATA-PAK. The ATA registers as a generic SIP device with the PBX, but it wasn’t registering. I needed to log in to the web interface, and the client didn’t have the login.

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