Administering Time-to-Service (TTS)

The TTS feature was originally introduced to reduce the time for IP H.323 endpoints to recover after network outages, for example, after Communication Manager level 2 reset. The TTS feature is mostly applicable to contact centers. TTS improves the time for IP soft phone endpoints to come in to service when a large number of endpoints try to register quickly. This occurs at the time of agent shift changes for Avaya one-X Agent users in contact centers

You can also use the TTS technology for recovering signaling sockets when Duplicated Processor Ethernet (DPE) systems undergo a processor swap. The TTS feature was introduced in Communication Manager 4.0. The TTS endpoint support was introduced to Avaya one-X Agent in R2.0 SP3. This is the only Soft Phone implementation for which TTS is available. TTS separates the registration process of endpoints from the H.323 signaling socket establishment with Communication Manager. The endpoint initiates the RAS process, but Communication Manager manages the subsequent signaling socket establishment process for all endpoints in a coordinated manner.

With non-TTS registration, the endpoint manages RAS and the H.323 socket establishment in a tightly coupled manner. Each C-LAN can handle up to five simultaneous socket establishment requests. Therefore, the system rejects the sixth connection request from an endpoint, and the endpoint must retry the connection or use another socket resource. Communication Manager in conjunction with TTS can handle these mass registration events efficiently. In addition, the TTS enables simplified firewall management, since the socket establishment is initiated from the C-LAN IP addresses that are on the trusted side of firewalls.

Prerequisites

The TTS feature is available in Communication Manager 4.0 and higher and in Avaya one-X Agent 2.0 SP3. In the Desk Phone mode, ensure that the you have the following firmware:

FW 2.8 or later on the 46xx H.323 IP telephones
FW 1.2.1 or later on the 96xx H.323 IP telephones

You can control and administer the TTS feature for extension registration in the Network Region to which the extension belongs. All extensions in a Network Region receive the same treatment.

Log on to Communication Manager to gain access to the Communication Manager administration interface.
Alternatively, you can use Station Administration Terminal (SAT) to gain access to the Communication Manager administration interface.

Navigate to page 2 of the ip-network-region form.

The following fields corresponding to TTS appear on page 2 of the ip-network-region form:

TCP SIGNALING LINK ESTABLISHMENT FOR AVAYA H.323 ENDPOINTS
Near End Establishes TCP Signaling Socket? y
Near End TCP Port Min: 61440
Near End TCP Port Max:61443

For TTS operation, ensure that the Near End Establishes TCP Signaling Socket? option is set to y.
The Near End Establishes TCP Signaling Socket? option allows you to enable or disable TTS on a per network region basis. By default, TTS is turned on in the system.
In the Near End TCP Port Min field, specify the minimum number of the TCP ports to be used during the TCP socket establishment.
In the Near End TCP Port Max field, specify the maximum number of the TCP ports to be used during the TCP socket establishment.
Note
Using the Near End TCP Port Min and Near End TCP Port Max fields, you can specify or limit you to specify/limit the TCP port range used during TCP socket establishment. The system defines the C-LAN resources to the IP network as on the trusted side of any firewall. The system allows the outbound socket establishment from trusted resources, and you need not change the firewall rules if you change the TCP port range.