OBI110 setup with Comcast Service
drgeoff:
SteveInWA's explanation is what I expected. It is very similar to the 'Broadband Talk' service that my UK ISP introduced about 10 years ago. The ADSL modem/router/Wi-Fi boxes that they supplied had a built in SIP ATA which fed a standard phone instrument jack on the back and an internal DECT base station. Customers could either use an ordinary corded phone or purchase the custom, matched styling DECT handset with charging stand which could be free-standing elsewhere in the house or clipped to the front of the modem after removing a cover strip.
Being an ADSL modem the existing PSTN (POTS) line was available to the box's innards. Thus it could be user-configured that the handset could make and receive calls on both the POTS and the VoIP number. Calls went out via VoIP unless preceded by dialling '5'.
Although SIP based the credentials were not given to end-users, the configuration being semi-automatic. Customers were given a unique code which they entered on a web-page hosted by the ISP. That triggered the atomatic configuration. However, some clever people eventually found that it was very simple to capture the long configuration string and find the SIP username and password within it. I did that and was able to configure the VoIP service on a Linksys SPA3000.
The ISP retained the facility on 3 generations of their modem but then, citing insufficient customer use, stopped offering it to new customers and the ATA/DECT hardware was not incorporated into subsequent modem versions. When I upgraded to fibre-to-the-cabinet plus VDSL, the VoIP line was cancelled by the ISP.
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