normal 3-way calling issue

[goobergob]

I may be blind or stupid, but anyone notice that conference button only comes up when you call both parties? Is there an option to conference I'm missing when one line calls in?

case 1: I dial party B, put B on hold. I then call party C, and the Conference button appears and I am able to 3-way. yay.

case 2: I dial party B and then party C calls me. B is on hold, but instead of the Conference button, I have a Swap button. No button to conference.

case 3: same as case 2 but party B calls me first and then I dial party C. Swap button appears.

case 4: both party B and C call me. Swap button appears.

Nearly every phone I've had can still conference parties in. Am I missing something or is this option in a menu? Pretty ridiculous if it's not there...