Technicolor TB30, Administrator'S Manual

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TB30s SIP Administrator Guide v1.3
Page 214 of 259
Talk and hold event packages for click-to-answer and other
3PCC scenarios
This extension provides the ability for an Application Server to send an
asynchronous NOTIFY event to our phone, using an existing INVITE dialog.
This will allow an user responds hold and unhold a call from an application in
a PC (e.g: Broadsoft Call Manager) without touching any key in the phone.
When a UAC sends an INVITE to a UAS, it adds an Allow-Events header to
the request, indicating all of the event packages it supports. When a UAS
responds to the INVITE with an 18x provisional response or a 200 OK
response, it adds an Allow-Events header indicating all of the event
packages it supports.
Talk event
The Allow-Events header in the 180 Ringing indicates to the Application
Server that our phone supports remote call control primitives. When the
user (e.g: handling a PC) selects the incoming call and clicks on “talk” – an
event is sent from the call client to the Application Server, indicating that the
user is requesting that the incoming call be answered. The Application
Server reacts by sending a NOTIFY to the SIP phone.
The IP phone indicates that it honors the request by responding to the
NOTIFY with a 200 OK. The phone then automatically answers the incoming
call by forcing off-hook and activating the speaker.
Hold event
The call is set up as usual. Now the user at the call client decides to
remotely hold the call and sends a “hold” request to the Application Server.
The Application Server discovered that the endpoint supported the hold
event package through an Allow-Events header in the 180 Ringing
provisional response.
The Application Server reacts by sending a NOTIFY with a hold event. Note
that this NOTIFY is sent using the same dialog as the session it is acting on.
Persistent VLAN
This is an improvement in VLAN configuration via DHCP. This is deeply
explained in VLAN provisioning via DHCP.pdf placed in the same folder as
this.