Welcome to the site. Your original Expert is offline. I'm PDtax, and can assist with your Offer in Compromise question.
The OIC process is involved, and requires submitting a detailed financial disclosure and negotiating with an IRS representative. It's unlikely you can set this up over the phone.
If you need time to review your options, and IRS isn't responding to phone calls, I suggest hiring a tax
professional to assist. They can contact IRS directly, and likely head off more aggressive collection efforts while you decide how best to resolve your IRS tax debt.
The mere hiring of a tax pro will tell IRS that you want to address the matter, and very likely will give you time to act.
If you don't have funds to hire a tax pro, but you still want time to act, I can suggest completing and filing form 911, application for Taxpayer Assistance Order, with the Taxpayer Advocate's Office (TAO) of IRS. Since you have tried to contact IRS and can't get help through normal channels, the TAO is required to review your case and assist. I have found them to be very effective at getting things done, from improving communication with IRS collection personnel to assistance with negotiations.
The form and filing instructions can be found at http://www.irs.gov/pub/irs-pdf/f911.pdf. Again, i believe you qualify for assistance because you could not resolve your case through normal channels, and you are being threatened with enforced collection.
Good luck with your case. Since more than one Expert has assisted, please direct any follow up to the Expert of your choice by name. I'm PDtax.