Avaya IP Line Bedienungsanleitung PDF herunterladen (Seite 166)

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Page 166 of 910 Features

553-3001-365 Standard 4.00 August 2005

Hold

The Hold function differs from the Mute function as Hold does not cause

problems with the audio stream. Table 27 describes the Hold process.

NAT and VLANs

Support of Virtual LANs (VLANs) is entirely dependent on the Layer 2

switch to which the IP Phone is immediately connected. Users behind a NAT

router may find that the configuration of a VLAN ID is unsupported by their

NAT router. Refer to the documentation of the NAT router to determine if a

VLAN ID is supported.

Users who attempt to use an IP Phone with VLAN enabled on a NAT router

that does not support VLANs cannot connect to the CS 1000 system. If DHCP

is used, the IP Phone cannot even obtain an IP address.

Note: Most NAT routers do not support 802.1Q Tagging. If 802.1Q

Tagging is not supported on the NAT device, the checkbox Enable

802.1Q support in Element Manager’s Node Summary Page under the

“QoS” Section must be left unchecked. See Figure 35 on page 167. If

Table 27

Hold process

Description

1 When an IP Phone user places a call on Hold, the audio stream in both the

Transmit (Tx) and Receive (Rx) directions closes.

2 The NAT device begins aging the translation.

When the audio stream is closed and no voice path is present, the IP Phone

defaults to sending periodic non-RTP packets to keep the NAT translation alive.

Therefore, when a call is put on Hold, the IP Phone defaults to sending these

non-RTP packets.

3 When the call is retrieved from Hold, a new set of open audio-stream messages is

issued by the LTPS and new connections are established reusing the same NAT

translation.

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