Sip Endpoint Support - Avaya IP Office 8.1 Product Description

SIP Endpoint Support

Session Initiation Protocol (SIP) is an open signaling protocol for establishing any kind of real-time
communication session. The communication session can involve voice, video, or instant messaging, and can
take place on one of many devices that people use for communicating: laptop computer, PDA, cell phone, IM
client, IP phone, and so on. SIP has been developed in the Internet Engineering Task Force (IETF) by common
participation from various vendors, including Avaya.
Avaya IP Office supports SIP for telephony functions to enable the usage of standard based SIP endpoints for
Voice and Fax communication. In pure SIP systems, IP Office expands the feature set beyond the SIP standard,
offering a wealth of IP Office features also on SIP endpoints delivering a feature rich system that a pure-SIP
server based on the SIP standard only can't deliver. With that, IP Office delivers the best of both worlds,
supporting standard based IP telephones while delivering a wealth of features consistently between SIP, digital
and Avaya IP endpoints.
IP Office SIP endpoint implementation is built on two major SIP components: SIP User agents, and SIP Server
components.
SIP Components
SIP Endpoints (User Agents)
User agents (UAs) are applications in SIP endpoints (such as a SIP phone, cell phone, PDA, or workstation) that
interface between the user and the SIP network.
SIP Servers
IP Office has implemented the required functionality of the SIP servers mentioned below not only to provide SIP
endpoint support but also to allow full interoperability between SIP endpoints, other IP telephones based on
H.323, Digital and Analog telephones as well as IP Office trunks (Analog, digital or SIP based)
SIP servers provide centralized information and enablement services in a SIP ecosystem. The core SIP servers
and their functions are summarized here. IP Office provides the required the features of the following two
servers for Voice and FAX communication.
Registrar Server
·
When SIP IP telephones come online, they need to make sure that others are aware that they're
available to take and make calls. The Registrar authenticates and registers the IP phone (often directly
related to a specific user) when it comes online, and then stores information on the telephones logical
identities.
Proxy Server
·
A proxy server takes SIP requests, processes them, and passes them downstream while sending
responses upstream to other SIP servers or devices. A proxy server may act as both a server and a
client, and can modify a SIP request before passing it along. A proxy is involved only in the setup and
teardown of a communication session. After user agents establish a session, communications occur
directly between the parties.
Functionality of the following two SIP servers are generally available by IP Office using existing IP Office
functionality. Therefore, while functionality is provided, e.g. allowing hot desking (also for users using a SIP-
endpoint) in a small community network, a consistent methodology between SIP and non SIP endpoints is used
to deliver those features
Location Service
·
As users roam, the network needs to be continually aware of their locations. The location service is a
database that keeps track of users and their locations. The location service gets its input from the
registrar server and provides key information to the proxy and redirect servers. IP Office provides hot
desking support, delivering a similar functionality but working consistently between SIP and non SIP
endpoints.
Redirect Server
·
If users are not in their home domains, sessions bound for them needs to be redirected to them.
The redirect server maps a SIP request destined for a user to the device "closest" to the user. In IP
Office, call forwarding and Follow me functionality is used to provide again consistent functionality
between all type of endpoints.
Supported functionality for SIP endpoints in IP Office
SIP endpoints are supported on IP Office for Voice (Audio) and Fax (T.38) communication.
This allows the usage of standard compliant IP telephones using the open SIP standard, giving customers a
choice of endpoints of different manufacturers including special purpose devices like conference telephones,
hotel telephones or terminal adapters.
In order to use a non-Avaya SIP endpoint with IP Office, a "Third party IP endpoint license" is needed. This
license will continue to support endpoints based on the H.323 standard but will also be required for generic SIP
endpoints on IP Office. Avaya IP Office SIP telephones use the IP End Point license.
Product Description
IP Office 8.1
© 2012 AVAYA All rights reserved.
Page 261
Issue 26.k.- (16 August 2012)