Quadro Quadro16xi Installationsanleitung PDF herunterladen (Seite 62)

Quadro Manual II: Administrator's Guide Administrator’s Menus

Quadro2x, 2xi, Quadro4x, 4xi, Quadro16x, 16xi; (SW Version 5.2.x) 61

Extension Codecs

To establish IP voice communication, both partners have to use the same codec. When establishing the communication line, this codec is

negotiated. If the caller does not find an appropriate codec, the communication cannot take place. If you want to be reachable by all IP calls, it is

helpful to support as many codecs as possible. In this case, all the codecs that Quadro offers should be added to the Codecs table. Some codecs

require a high transfer rate of up to 64 kbit/s. If you are certain you do not want to use these codecs, make sure they are not listed in the table

Codecs.

The Codecs table lists the voice and video codecs supported by the Quadro. Each table entry is assigned a checkbox that is used to manipulate the

entry, for example to disable, to move it up or down, etc.

The table entries in bold type indicate codecs enabled for the selected extension/attendant/conference. The enabled codecs participate in codec

negotiation at the call setup. The order of the enabled codecs is very important. Each codec in the table has a higher priority than the codecs below

it, and a lower priority than the codecs above it. A codec placed at the top of the table is used as the preferred codec. When establishing a call, the

system will try this codec first. If the remote party does not support the preferred codec, the following codecs will be tried out strictly in the order given

in the Codecs table.

Please Note: Pay attention when configuring Auto Attendant Codecs as they are used by virtual extensions for redirecting the incoming calls.

Enable/Disable functional button is used to enable or disabled the corresponding codec for the extension. When the codec is disabled, the

extension user will not be able to use it for placing a call.

The Move Up/Move Down buttons are used to move the selected codec one level up/down in the table.

The Make preferred button moves the selected codec to the top of the table, setting its priority to the highest. Clicking the Make preferred button

when a disabled codec is selected will first enable the codec and then move it to the top.

The Out of Band DTMF Transport checkbox enables

DTMF code transmission in parallel with the voice

stream. The destination receiving the DTMF code will

play it locally if it supports the feature. This is helpful to

avoid DTMF’s loss upon bad traffic. This feature is

valuable for all codecs but it is especially recommended

to enable it in case low bit rate codecs (G.729, G.726/16,

etc.) are selected.

The Enable T.38 FAX checkbox enables the FAX tone

detection and the T.38 codec support for the FAX

transmission from/to the FAX machine/modem attached

to the line. It also enables the T.38 codec support for

incoming unified FAX messages.

The Enable Pass Through FAX checkbox enables the

FAX tone detection and the G.711 codec support for the

FAX transmission from/to the FAX machine/modem

attached to the line. It also enables the G.711 codec

support for incoming unified FAX messages.

If both of the above checkboxes are enabled, the T.38

codec will be used as a preferred codec for FAX

transmission. If it is not supported by the peer, the G.711

codec will be used instead. If the extension is attached to

the line that has no FAX machine/modem connected (the

extension is virtual or is attached to an IP line), the

incoming FAX can only be stored in the extension's voice

mailbox. To allow FAX to be stored in the voice mailbox,

the extension's user should not answer the incoming

calls, so that they are forwarded to the voice mailbox.

Fig. II-109: Extension Codecs list

Please Note: If both of the above checkboxes are disabled, no FAX transmission to the peer's voice mailbox will be possible.

Enable Pass Through Modem checkbox is only available for Auto Attendant and extensions attached to the FXS lines (it is not available for

extensions attached to the IP line). This checkbox enables the modem tone detection and the G.711 codec support for the data transmission from/to

the modem attached to the line. During data transmission, Silence Suppression (see RTP Settings

) and Echo Cancellation are being disabled on the

line.

Please Note: If the extension/attendant is intended to accept modem connections, disable the Enable T.38 FAX checkbox to allow the system to

identify the modem tones correctly. Otherwise, the modem connection may fail.

The Force Self Codecs Preference for Inbound Calls checkbox enables the usage of your own preferred codecs (if available on both peers) for

the IP connection establishment on the extension.

Secure RTP Settings are used to configure secure voice over IP communication on the Quadro. The SRTP Policy drop down list is used to select

the secure IP connection policy. For IP phones, the following options are available:

• Make and accept only secure calls - only the secure calls will be generated and accepted.

• Make and accept only unsecure calls - only the unsecure calls will be generated and accepted.

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