Hello & Welcome to Just Answer,
I'm Greg and will do my best to assist you today.
Sorry to hear of any issue you are having with your phones.
To help you with this issue, may I ask:
1) How many TOTAL cordless handsets do you have with this system?
2) What phone service provider (phone company) you have for this phone line?
3) What do you mean by "3 way call"? That is, what people will be involved in this call?
Please REPLY using the box below.
I see a couple of other questions have been opened (and closed) for this topic.
Please try to REPLY (and send) on this question only - so we can look into this for you.