Avaya 3641 Administration Manual page 44

Telephony Protocol
You can select the VoIP protocol that your site is licensed to download and run using the
Telephony Protocol. The SIP protocol used for the Avaya 3641/3645/6120/6140 IP
Wireless Handsets requires license option selection 56. Any other protocol will cause the
handset to malfunction.
Note:
You may need to change the protocol from the default (Type 033) to the SIP protocol
which is Type 056. If any parameters have been changed, run Restore Defaults before
configuring settings under the new protocol.
PTT/Emerg. Button
This option appears only on the Avaya 3645/6140 IP Wireless Handset. You can
configure the Push-to-talk button on the left side of the handset to either standard PTT
functionality or to dial the specified emergency call number when pressed twice within
two seconds. In the standard PTT functionality, you push and hold the button to transmit
a PTT broadcast. These are mutually exclusive options. Both are disabled by default.
When you use the Handset Administration Tool to configure this option, ensure that you
disable the PTT option in the PTT Admin tab under Handset type before enabling the
Emergency Dial option in the Phone Config tab. When you enable PTT, the
Emergency Dial option will not be available and is grayed out.
Push-to-talk [Disable/Enable] – If enabled, the PTT options will appear on the Config
menu for the end user to subscribe to allowed channels, etc. If disabled, the PTT options
will not appear on the Config menu and the Emergency Dial option may be enabled.
PTT is disabled by default. When enabled, all 24 PTT channels are allowed by default.
To toggle the allowed status of any channel, select Allowed Channels, scroll to the
channel to be disallowed and press NavOK. Allowed channels are displayed with an
asterisk (*) in the left column. Only those channels allowed in the Admin menu will
appear on the Config menu where they can be subscribed to by the end user. The
priority channel, labeled by default as channel 25, may be set and made available to all
PTT handsets. When you make a PTT broadcast on the priority channel, the broadcast
overrides any active PTT transmission on all other channels.
Note:
When using the HAT, the administrator can select a default PTT channel for the user.
However, the user can override the administrator's choice and change the default
channel to any enabled channel, except the priority channel. If a default channel is not
set, the user must select a channel from the enabled channel list before transmitting.
Emergency Dial – the Emergency Dial option allows you to enable or disable the
feature. When enabled, the handset will dial the number programmed into the
Emergency Number option when the panic button is pressed twice within two seconds.
44 Avaya 3641/3645/6120/6140 IP Wireless Handset SIP Administration Guide June 2012