A single SIPBroker network registration will allow you to receive calls from SIPBroker to your network switch (Asterisk works wonderfully well) for you to distribute to your network's members. Configuring a single line device (Line 1 of your ATA) will not provide the requisite networking functionality at your end to do what you describe.
If you are shy about setting up Asterisk you may want to investigate voxalot service to do your networking for you.
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