Avaya 9608 Administrator's Manual page 38

Network Requirements
TTS changes the way IP phones register with their gatekeeper, reducing the time to come into
service.
In the absence of TTS, the system uses a coupled two-step procedure to bring the IP phones into
service:
1. H.323 registration
2. TCP socket establishment for call signaling
The TTS feature separates these steps. In Communication Manager Release 4.0, you can enable IP
phones for service with just the registration step. TCP sockets are established later, as needed.
The TTS feature also changes the direction of socket establishment. With TTS,Communication
Manager, rather than the phone, initiates socket establishment, which further improves
performance. In Communication Manager Release 4, you can enable TTS by default and can also
disable TTS for all IP phones in a given IP network region by changing the IP Network form. TTS
applies only to IP phones whose firmware has been updated to support this feature. TTS does not
apply to the following phones: third party H.323, DCP, BRI, and analog.
From Release 3.0 onwards, 9600 Series IP deskphones can accept an incoming connection request
from a server on the gatekeeper list, use this new connection to replace an existing connection, and
continue operation without the need to reregister. With this mechanism, Communication Manager
starts a new connection to each deskphone during a server interchange. These phones then move
quickly to the server and transition from the standby to active state.
The 9600 Series deskphones support the TTS feature from Release 6.0 onwards.
For more information, see the Administrator Guide for Avaya Communications Manager, 03-300509.
Administering 9608/9608G/9611G/9621G/9641G IP Deskphones H.323
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Comments? infodev@avaya.com
June 2014