Use an ATA to Connect an Analog Phone with an IP Phone System.
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Amazon.com: Cisco SPA122 Small Business ATA with Router (Renewed) : Office Products
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Amazon.com: MyVolts 5V Power Supply Adaptor Compatible with/Replacement for Cisco SPA100 Series, SPA112, SPA122 ATA - US Plug : Tools & Home Improvement
Cisco SPA122 ATA 2 Port Adapter - Kinect Communications
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Amazon.com: MyVolts 5V Power Supply Adaptor Compatible with/Replacement for Cisco SPA100 Series, SPA112, SPA122 ATA - US Plug : Tools & Home Improvement
Amazon.com: MyVolts 5V Power Supply Adaptor Compatible with/Replacement for Cisco SPA100 Series, SPA112, SPA122 ATA - US Plug : Tools & Home Improvement
Amazon.com: MyVolts 5V Power Supply Adaptor Compatible with/Replacement for Cisco SPA100 Series, SPA112, SPA122 ATA - US Plug : Tools & Home Improvement
Amazon.com: Cisco SPA112 2 Port Phone Adapter with Router (Renewed) : Cell Phones & Accessories
Cisco SPA122 Analog Telephone Adapter w/Router (SPA122)
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Amazon.com: Cisco SPA122 Small Business ATA with Router (Renewed) : Office Products
Amazon.com: MyVolts 5V Power Supply Adaptor Compatible with/Replacement for Cisco SPA100 Series, SPA112, SPA122 ATA - US Plug : Tools & Home Improvement