When preparing for a conference call, a speaker often spends a lot of time poring over what they will say and trying to get their planned remarks just right. Then they just leave their introduction up to chance. If you are engaged to speak as part of a conference call that is being sponsored by another organization, it is likely that someone else will be introducing you to the audience.
If it all possible, you should write your own introduction. Why? While there are no guarantees that it will be delivered as written, it may be very helpful.
You will prevent a rambling introduction that can take away time from the actual conference call.
It allows you to decide which parts of your career you want to highlight. You know which part of your experience is most relevant to the audience. It will also give you the opportunity to promote parts of your business that you really want to push.
On the other hand, you don't want to deliver your remarks as if you are reading them word for word from your notes. You want to sound informed, but conversational. So your notes should include all of the important points you want to make, but you shouldn't try to write down every single phrase you expect to say.