Orbtalk have a range of SIP trunk products that work with the Avaya SES
Session Initiation Protocol (SIP) goes beyond other VoIP protocols through its power to connect multi-media devices with each other and with existing Web assets. While it will lower telecom operating costs, ultimately, SIP is the key to bringing powerful telephony functions—unified communications, click-to-communicate, intelligent find-me, multi-media collaboration—to desktop, mobile endpoints, as well as business applications.
The good news is that it’s possible to gain immediate benefits from SIP without a complete overhaul of your existing Avaya telecom infrastructure. SIP migration can be accomplished through a series of steps that deliver advantages at each point.
Avaya’s three steps is a low-risk approach that doesn’t involve a significant initial investment. When you are ready, you can extend SIP beyond the edge, to the telecom core and eventually to user desktop and device endpoints.