Still having problems establishing link to dispatcher. Steps that I have taken:
1. Received base with T-Mobile module. Would not connect. Talked with SS which then sent me a Verizon module.
2. Installed Verizon module. After moving base all around house, no connection to dispatcher through Verizon.
3. I have Verizon cell phone service and can make calls with iPhone from within my house. The Verizon signal is not great (1-2 bars on 3G, occasionally get 4g) but can make and receive calls.