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. 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. 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 does not apply to the following phones:
third party H.323, DCP, BRI, and analog.
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.
TTS is supported with the following profiles:
• Challenge
• Annex-H
• H.323 signaling over TLS
TTS-TLS is not supported with the following features:
• IPSec VPN – only challenge and Annex-H are supported. H.323 over TLS is not supported
over VPN.
• Unnamed registration
For more information, see the Administering Avaya Aura
®
Communication Manager, 03-300509.
Network requirements
March 2018 Administering Avaya 9608/9608G/9611G/9621G/9641G/9641GS IP Deskphones H.
323 38
Comments on this document? infodev@avaya.com
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