The range allows people on the move to log into an Eclips server from anywhere and then begin functioning immediately as an extension of that server.
According to Avaya director Simon Bunegar, "We are talking about 100% of PBX function on a 100% IP structure."
Channelling voice traffic over an IP network offers the potential for significant savings in infrastructure costs.
Eclips strengthens Avaya's hand in the Voice over IP market sector, which it entered in May last year.
Avaya, formerly the Enterprise Networks Group of Lucent Technologies, will become a separate listed company on 2 October.