User guide: Cisco ATA 191 and ATA 192 Analog Telephone Adapter User Guide for Multiplatform Firmware

Admin guide: Cisco ATA 191 Analog Telephone Adapter Administration Guide for Cisco Unified Communications Manager

The default user and password should both be: admin

If needed you can perform a factory reset, this will erase all passwords, configurations, etc. To do it, press and hold the RESET button for about 10 seconds

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