I have heard of a number of cases where such an offer was made to sucker the inventor into going outside his jurisdiction. The inventor was sued shortly afterward in the infringers jurisdiction, costing them many thousands of dollars to defend themselves far from home. In such a situation I suggest you request that they come and meet in your jurisdiction. If they haven't acknowledged your initial contact call the president or CEO of the company and request a meeting. It is best to remain calm and allow your opponent to slowly come to terms with the fact that you are not going to tolerate theft of your intellectual property.
Companies have a personality the same as individuals.
There is a tendency for management of each company to attract other people with the same values or lack of values. The honest companies will try to settle, but it may take several meetings and some time to convince them, typically one to two years. Dishonest companies must be shown that there is a price to be paid for their actions. Companies that intentionally infringe patents usually have other problems with the way they apply technology. Infringers often cut corners in their engineering.