Whether you are going to be required to make changes to your infrastructure or not, you should be aware that you certainly do not have to go through this big change all on your own. There are actually a great many companies nowadays that specialize in helping ISP services to begin offering IPTV services or to expand their current IPTV offerings. These companies typically offer suites of software and hardware solutions and more that can help you to get your plans off the ground.
While you could potentially launch your new services without the help of one of these companies, it is typically not recommended to do so unless you have very extensive experience with and knowledge of the IPTV industry. Even then, you are still taking a risk- more of a risk than you would by trusting one of these companies. That is because, not only do such companies have helpful tools and services to offer you, but they also know the industry inside and out, can provide you with valuable information about your competitors, and can also help you to promote your new services to the right people and in the right way, so it really is best to go with this option.
The vast majority of companies have suites and services that are ready and made to work with broadband infrastructure, even those that do not yet meet the minimum requirements. Thus, if you do have the infrastructure in place, then you are typically good to go when it comes to working with these services. If you do not, then you can still work with them; you just may need to be prepared to spend a bit more money. You can and should request pricing information upfront so that you are not met with any unwelcome surprises.
With that said, do not assume that all "switch over" services are the same. There are a lot out there, due to the recent surge in ISP companies switching over to also offer IPTV services. Make sure you choose one that, in addition to all of the features discussed here, also offers you VoD capabilities, CatchUp capabilties for users, and all the other things that modern-day customers want and demand in their services, including the ability to "go mobile" and to take their viewing experience to all of their devices.
Thus, with that said, you really want to do your research when it comes to choosing a company to help you. Look for one that has knowledge and experience in the industry- not one that is just looking to get in on the "gravy train." Also, compare prices from one service to the next to find the best possible pricing to meet your budget while still enabling you to offer high quality services that will build and/or maintain your reputation.
As you can see, integrating IPTV services isn't all that difficult, but it does take some commitment and effort on your part. As long as you are willing to do your piece, however, then you should benefit greatly from making this positive change in your business structure.