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90 4600 Series IP Telephone LAN Administrator Guide
RTCP itself does not improve QoS, but provides information to help identify where problem
areas might be.
You cannot change the telephone’s RSVP or RTCP parameters directly on the telephone or by
TFTP or DHCP administration. The only way to change these parameters is on the H.323
telephones, and such a change requires appropriate switch administration. See your Avaya
Media Server administration documentation for more detail. You cannot change these
parameters on a SIP IP telephone.
Internal Audio Parameters
The AUDIOENV variable provides control of some internal audio parameters in the 4600 Series
IP Telephones. Avaya does not recommend that customers set these values. In certain
situations, particularly in noisy environments, Avaya Tier 4 engineers might recommend that
you set the system parameter AUDIOENV.
AUDIOENV is an index into a table that impacts four internal variables:
AUDIOENV is calculated as:
AUDIOENV= (27 * AGC_Dyn_Range) + (9 * Exp_thresh_Hd) + (3 * Exp_thresh_Hs) + Tx_Gain,
which results in a range of 0 to 107.
Set AUDIOENV 0 is the nominal setting (0,0,0,0)
Table 6: Internal Audio Variables
Variable Description Possible Values
AGC_Dyn_Range AGC dynamic range. 0 for a typical office environment (+/-9dB), 1
for +/-12dB, 2 for +/-15dB, and 3 for +/-18
AGC Dynamic range variation.
Exp_thresh_Hd The expansion
threshold for the
headset.
The expansion threshold for the headset has
a default value of 0 for a typical office
environment, 1 for call center applications,
and 2 for “other” audio environments.
Exp_thresh_Hs The expansion
threshold for the
handset.
The expansion threshold for the handset has
a default value of 0 for a typical office
environment, 1 for call center applications,
and 2 for “other” audio environments.
Tx_Gain Transmit gain. Transmit gain has a default value of 0 for
normal transmit gain, 1 for +6dB of gain, and
2 for -6dB of gain.