AT&T is planning to offer rural customers a wireless-based landline replacement service in parts of its local service territory that are "particularly high-cost areas." AT&T said in an FCC filing last week that the offering will be part of the rural network expansion plans that it announced last week . In the filing, AT&T also asks the FCC to conduct trials of a TDM-to-IP transition in select wire centers chosen by incumbent local exchange carriers (ILECs). The wireless landline replacement offering is referred to as a Mobile Premises Service in the FCC filing. But an AT&T spokesman told Telecompetitor that the offering is the same one previously launched in areas outside AT&T's local service territory under the name AT&T Wireless Home Phone . That offering provides customers with an adapter device into which end users can plug a traditional landline phone, enabling it to place calls to and receive calls from the AT&T wireless network. The AT&T spokesman declined to confirm whether the offering will be an optional offering or mandatory landline replacement in the high-cost areas. Current telecom policy might only allow it to be an option. But AT&T is hoping to change that scenario. According to last week's FCC filing, AT&T sees the wireless landline replacement service as one piece of a transition of its network from TDM to IP. The carrier noted in the filing that through a combination of DSL and LTE it aims to extend IP-based broadband services to 99% of all customer locations within