My SAP2102-R Voip adapter is not working. Can I buy any VoIP adapter from inernet and make it work?

Have active VoIP service provider, just the adapter is failed and service provider is not replacing it free.

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1. How can i bridge my wireless connection at my hotel on my laptop to a VOIP adapter via ethernet cable?
2. Will there be a problem if I connect the VOIP adapter to my cable modem instead of my wireless router?
3. Is there an online test I can use to see if VOIP will work well?
4. What is the best hardware combination (router, modem, voip adapter)?
5. Is it possible to wire a VoIP adapter to all the landlines in the house?