Hi there,

First of all, thank you very much for considering Grandstream products, we all very appreciate it. Regarding to your question and based on your condition, I think you have two accounts to be used, one in your office and one at home. Am I right? In this case, GXP-1200 would not fit you, cause it only has one account. GXP-1450, on the other hand, fits you perfectly. GXP-1450 has two accounts and two lines of each account. It means you can register both of your accounts 3511 and 3551 at same time without any problems. Also, every account has 2 lines to make sure even you are in the middle of talking with another guy, you will not miss any incoming call.

Here's the link of GXP-1450, you are also welcomed to choose other Grandstream products. Thank you.

http://www.grandstream.com/index.php...phones/gxp1450