AASTRA 53i ip phone Manual

Model 53i IP Phone User Guide  133

Customizable Callers List Key

Your System Administrator can specify an XML URI that creates a custom Callers 
List application for your phone. When you press the Callers List key, the phone 
accesses a custom XML URI Callers List instead of the standard Callers List. Contact 
your System Administrator for more information.

Autodial (Hotline and Warmline)

Your System Administrator can configure an autodial feature on your phone. If 
autodial is enabled, the phone automatically dials a preconfigured number whenever 
it is off-hook. Depending on the configuration specified by your Administrator, the 
Autodial functions as either a “hotline”, or as a “warmline,” as follows:

• Hotline: The IP phone immediately dials a preconfigured number when you 

lift the handset.

• Warmline: The IP phone waits for a specified amount of time after you lift the 

handset before dialing a preconfigured number. If you do not dial a number 

within the time allotted, then the IP phone begins to dial the number. 

The Autodial feature is available on a global or per-line basis. Contact your System 
Administrator for more information.

Centralized Conferencing

The 53i supports centralized conferencing for Sylantro and Broadsoft servers. This 
feature provides centralized conferencing on the SIP server (versus localized, on the 
phone). Your System Administrator must enable this feature on your phone before 
you can use centralized conferencing.
Centralized Conferencing allows you to perform the following:

• Conference two active calls together into a conference call. 
• When on an active conference call, invite another party into the call. 
• Create simultaneous conference calls on the same IP phone (Sylantro servers 

only). For example, a user at extension 2005 could create two conferences, 

and put one conference on hold while conversing with the other party:

- Line 1: conference together extensions 2005, 2010, and 2020.
- Line 2: conference together extensions 2005, 2011 and 2021. 

• Disconnect from an active conference call while allowing the other callers to 

remain connected.

• Add unlimited number of users to a conference (dependent on the limitations 

of the server).

• Join two active calls together into a conference.
• Join incoming or outgoing active calls to any existing conference.

Reference

For more information about using Centralized Conferencing, see 

 on 

Notes:
1. Any speeddial numbers that you configure on your IP phone are not 
affected by autodial settings.
2. If Autodial is configured on your phone, any lines that function as hotlines 
do not accept conference calls, transferred calls, and/or intercom calls.