I was the only one in the office today and I had a small call wave with about 4 similutaneous inbound calls. I know this because I was able to hear a phone at another desk ringing. I completed 3 calls and after the 3rd call my extension did not continue to ring as it did previously but the other desk kept ringing. I walked over to the other desk to pick it up but I guess by that time it must have gone to voicemail, although I was able to see which call queue it came from so I should have been rung. Any idea why this happened?