Setiing up Network with lease line and DSL redundancy

By mohitgoyal1981 ·
i have been asked to setup a network for redundant links with one lease circuit and ADSL link from local ISP.
Can any one please guide me to choose right hardware and design correct network diagram.
what i designed is as below

ISP(lease line),ISP(ADSL)---||router||---Firewall--Switch---Users

these Lease line and ADSL link will be terminated at Router having capability to dial DSL if lease line fails.
But now i am not sure how would a redundant link with be established and what correct hardware will be required for this.
Also after switch i am planning to put RTP300 VOIP router for VoIP phones.

Please help me with the corrections.

Thanks a lot in advance for your suggestions.

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