Avaya SIP Software 3.2 for 1200 Series Uživatelský manuál stáhnout pdf (Strana 194)

For example:

AUDIO_CODEC1 PCMA standard a-law

AUDIO_CODEC2 PCMU standard u-law

AUDIO_CODEC3 G729 729 codec

AUDIO_CODEC4 G722 wideband codec

AUDIO_CODEC5 G723 high-compression codec

would become

AUDIO_CODEC1

AUDIO_CODEC2

AUDIO_CODEC3

AUDIO_CODEC4

AUDIO_CODEC5

If the ordered list of codecs is small and no matching codec is found during negotiations, the

call drops, as the audio stream cannot be established. For backward compatibility with SIP

Firmware Release 1.X, the Device Configuration file supports the DEF_AUDIO_QUALITY

parameter as long as no codec is allowed using the new parameter AUDIO_CODECN, in which

case the DEF_AUDIO_QUALITY parameter is ignored and has no effect.

Specifying the DEF_AUDIO_QUALITY as High or Medium has the same effect as omitting the

parameter all together and without specifying codec through the new parameters.

If set to Low, then the list of default codecs is reversed before being sent in the SDP

negotiations. When you do not provide a text description in the Device Configuration file, the

application uses the default text description from the language file.

The AUDIO_CODECN parameters specifies the order of preference for audio codecs. If there

are no valid entries provided, then the parameter uses the default list of codecs. If you enter

a codec that is not recognized by the IP Deskphone then the parameter considers the codec

as a blank entry. To remove a codec from the list, you must first blank the entry, or change it

to an invalid codec name in the Device Configuration file.

Codec preference selection on the IP Deskphone

The Audio Quality Settings screen on the IP Deskphone allows the user to select an exact

codec by name. This grants the user full control over the audio settings used for inbound and

outbound calls.

The list of codecs is populated with the names of the codecs provided during Device

Configuration. If a text descriptor is provided for a codec in the Device Configuration file, it

appears after the codec name. The Audio Codec Ordering screen allows the user to modify

the order of preference of the codecs. To change the list of available codecs, you must perform

an update through Device Configuration. The IP Deskphone creates the ordered list from the

list of codecs in the Device Configuration file. The user can reorder the list using the

Audio codecs

194 SIP Software for Avaya 1200 Series IP Deskphones-Administration January 2012

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Avaya SIP Software 3.2 for 1200 Series Uživatelský manuál Strana 194