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Traffic engineering
Figure 56: Examples of media streams between Avaya endpoints
Although we stated that calls between two circuit-switched endpoints on different port networks
use an IP connection, the use of a circuit-switched center stage between the two PNs is also
supported. However, using circuit-switched facilities is not viable for interconnecting multiple
Media Gateways, or for interconnecting PNs and Media Gateways.
Figure 56: Examples of media streams between Avaya endpoints
how a call between an IP endpoint and a circuit-switched endpoint, as well as a call between
two circuit-switched endpoints, utilizes media processing and TDM resources. Calls between IP
endpoints are addressed first.
Communication Manager supports three general modes of connectivity between IP endpoints:
IP-TDM-IP connectivity, hairpinning, and shuffling. Hairpinning can take one of two forms: deep
or shallow. These various modes of connectivity are described in more detail below.
IP-TDM-IP connectivity
A call that uses IP-TDM-IP connectivity between two IP endpoints requires one bidirectional
media processing "channel" for each IP endpoint involved, as well as a bidirectional TDM
resource on every PN (or Media Gateway) that is involved in the call. This option most often
applies in systems that use a circuit-switched center stage for interport network connectivity. In
such a system, IP-TDM-IP is required in order for two IP endpoints in network regions not
configured for connectivity (in the sense of the IRCM matrix) to talk to one another.
164 Avaya Application Solutions IP Telephony Deployment Guide
provides some insight into
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