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Call processing
IP tie trunks
IP tie trunks are used to connect switches to one another. When an IP trunk is used to
interconnect two switches, the trunk can also carry standard (QSIG) and proprietary (DCS+)
signaling for interswitch feature transparency. The location of each other node (switch) in the
network is administered, and node selection is based on the dial plan and call routing features
such as AAR/ARS.
H.323 or SIP tie trunks are administered as a new type of trunk group. Instead of administering
ports as members of the trunk group, only the number of channels must be specified. Each
channel is analogous to a member trunk. In addition, an IP tie trunk can be made a member of a
signaling group so that a virtual D-channel can be administered and used to carry feature
transparency information.
Trunk signaling
Several variations of IP signaling must be accommodated for the variety of trunks supported by
Communication Manager. These are specified as options in the trunk group administration.
When the IP trunk is used as a tie trunk to another vendor's switch, gateway, or gatekeeper,
Communication Manager sets up a separate TCP connection for each call.
SIP
SIP stands for Session Initiation Protocol, an endpoint-oriented messaging standard defined by
the Internet Engineering Task Force (IETF). SIP is a text-based protocol, similar to HTTP and
SMTP, for initiating interactive communication sessions between users. Such sessions include
voice, video, instant messaging, interactive games, and virtual reality.
As implemented by Avaya for Communication Manager release 2.0, SIP "trunking" functionality
will be available on any of the Linux-based media servers (S8300, S8500 or S8700). SIP
trunking allows Avaya Communication Manager to communicate with SIP endpoints and
gateways across an IP network. In addition, Avaya Communication Manager supports SIP
endpoints, including the Avaya 4602 SIP Telephone and Avaya IP Softphone Release 5. In
addition to its IP telephony capabilities, IP Softphone R5 will also include Instant Messaging
(IM) client software, which is a SIP-enabled application that connects to the Avaya Converged
Communication Server for IM control.
100 Avaya Application Solutions IP Telephony Deployment Guide
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