
Introduction
8 Avaya Agent Deskphone 16CC Administrator Guide
Major Differences Between Avaya Agent Deskphone 16CC
and H.323 Telephones in a Call Center
Review this section if your administrative environment includes both SIP and H.323 signaling
protocol telephones in your call center. In this section, the phrase "Avaya SIP IP telephone" is
used interchangeably with "Avaya Agent Deskphone 16CC."
General IP Telephony - Two major protocols handle Voice over IP (VoIP) signaling, Session
Initiation Protocol (SIP) and H.323. The two protocols provide connection control and call
progress signaling, but in very different ways. These protocols can be used simultaneously over
the same network, but in general, no endpoint supports both protocols at the same time. Neither
protocol is necessarily superior, but each offers some unique advantages. SIP telephones, for
example, do not require centralized call servers, and can route telephone calls when a URL
identifies the destination. H.323 telephones leverage the call server’s presence into the
potential availability of hundreds of telephone-related features that a standalone SIP telephone
cannot provide.
Signaling - H.323 call center telephones ship from the factory with H.323 signaling. To use the
SIP protocol, applicable H.323 telephones must be appropriately converted and configured.
Avaya Agent Deskphone 16CC telephones ship from the factory with SIP signaling, requiring no
subsequent conversion.
Avaya Communication Manager Release - 16CC telephones are supported only by
Communication Manager Release 5.0 and greater. Communication Manager Release 3.0 and
up supports 9600 Series IP Telephones (H.323). SIP telephones use Avaya OPS (Outboard
Proxy SIP) features on the "trunk" side of Avaya Communication Manager whereas the H.323
(IP) telephones are supported on the "line" side of the Communication Manager.
Required Servers - Avaya Agent Deskphone 16CC telephones use two [additional] servers
that H.323 telephones do not:
- SIP Proxy server - provided by the SIP Enablement Services (SES) software, and
- Network Time server - which controls time-related parameters.
These servers are not necessarily separate hardware units.
Features & Functions supported by H.323 9600 Series IP Telephones, Not
Supported by
SIP:
This first release of the Avaya Agent Deskphone 16CC does not support the following, non-call
center-related features:
- Link Layer Discovery Protocol (LLDP)
- GigE (Gigabit Ethernet)
- Calltype Digit Conversion
- IEEE 802.1X
- Remote Ping & Trace Route
- Web browser
- SBM24 Expansion Modules
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