Phone rings, I pickup, but the system acts like I didn't

I brought a phone that was working OK from on location to another.

Phone rings, I pickup, but the system acts like I didn’t

It will either goto voice mail, or if I have it set to queue, it will play music to the person calling, even though I am picking up on the phone.

I have an aastra phone.

Outgoing calls are fine.

Do you know what could be causing this?

Could it be a problem with the cable internet connection I have at the new location?

TIA!