Avaya’s bid to acquire SIP application vendor Ubiquity was a tip-off that Voice over IP is becoming the center of importance at the enterprise telephony provider. Tuesday during Avaya’s earnings call the company confirmed that focus, announcing that it had sold more than 1 million IP phone lines for the third straight fiscal quarter, showing that corporate adoption of VoIP shows no signs of slowing.

While Avaya’s overall results seemed in line with analyst expectations, the IP numbers are increasing lines in the sand pointing toward an overall move from TDM to IP in the corporate communications arena. Avaya also said that investments like the Ubiquity buy will help it increase the integration of communications and business applications, a direction Avaya said it will look to for growth beyond its traditional telecom-supply businesses.

Traditional circuit switch is definitely on its way out.