Cisco DPC2425 DOCSIS User Manual page 22

How Do I Subscribe to High-Speed Internet and Telephone Service?
I Want to Use the Residential Gateway for Telephone Service
You will also need to set up a telephone account with your local service provider to
use your residential gateway for telephone service. When you contact your service
provider, you may be able to transfer your existing telephone numbers, or your cable
telephony service provider will assign a new telephone number for each current or
additional active telephone line. Discuss these options with your telephony service
provider.
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