VOIP Engineer applicants have rated the interview process at AT&T with 2 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 65.7% positive. This is according to Glassdoor user ratings.
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Call with your further team leader, so you can understand if you can work together, as well as questions about your knowledge in networking and VoIP, but not very hard or tricky ones