Avaya IP Line Bedienungsanleitung PDF herunterladen (Seite 88)

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Page 88 of 910 Features

553-3001-365 Standard 4.00 August 2005

Held calls

From the ACF feature perspective, held calls are considered to be established.

This means that the call is preserved on the Call Server despite TLAN subnet

or LTPS failure. The IP Phone itself is unaware of the state of any held call.

Phase 0/1 IP Phones

Phase 0/1 phones do not support ACF.

Feature key labels

If user-defined feature key labels have been changed but no datadump has

been performed, the changes are lost if there is a Call Server failure.

SIP telephones

SIP telephones appear as IP Peer endpoints to the system. See “IP Peer calls”

on page 87.

NAT devices

The ACF feature cannot handle the case of a NAT device changing the media

path’s mapping between the IP Phone's private address and public address

during the failover period. There is no way to discover the mapping while the

port is in use. For instance, if a main office failure occurs and the user

reregisters in local mode, NAT mapping is changed and the active call cannot

survive.

Control messages

The LTPS sends the Audio Stream Control and LEDs Control commands in

separate messages. If a failure occurs in the time between the two messages,

the Audio Stream and LEDs states may not be synchronized. For example, it

is possible for the Audio Stream to be muted and a network failure to occur

at just the right moment to prevent the LED Control message for the mute

LED from being received by the IP Phone.

Held Calls

When an idle IP Phone (one without an active speech path) reregisters, a

firmware download may occur if needed. If that IP Phone actually had calls

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