Avaya 4600 User Manual

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. 

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)

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.