Secure Call Indication Tone; Configuring Voice Codecs - Cisco 521SG - Unified IP Phone VoIP Administration Manual

Configuring Security, Quality, and Network Features

Configuring Voice Codecs

Configuring Voice Codecs
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide

Secure Call Indication Tone

This tone is played when a call that has been successfully switched to secure
mode. It should be played only for a short while (less than 30 seconds) and at a
reduced level (less than -19 dBm), so it does not interfere with the conversation.
To configure the tone, navigate to Admin Login > advanced > Voice > Regional.
Under Call Progress Tones, enter the tone string in the Secure Call Indication Tone
field. Defaults to 397@-19,507@-19;15(0/2/0,.2/. 1 /1,. 1 /2. 1 /2). See
Cadences, Call Progress Tones, and Ring Tones
A codec resource is considered allocated if it has been included in the SDP codec
list of an active call, even though it eventually might not be chosen for the
connection. If the G.729a codec is enabled and included in the codec list, that
resource is tied up until the end of the call whether or not the call actually uses
G.729a. If the G729a resource is already allocated (and since only one G.729a
resource is allowed per IP phone), no other low-bit-rate codec can be allocated for
subsequent calls. The only choices are G711a and G711u.
Since two G.723. 1 /G.726 resources are available per IP phone, you should disable
the use of G.729a to guarantee support for two simultaneous G.723/G.726
codecs.
Negotiation of the optimal voice codec sometimes depends on the ability of the
Cisco SPA IP phones to match a codec name with the far-end device or gateway
codec name. Cisco SPA IP phones allow the network administrator to individually
name the various codecs that are supported such that the correct codec
successfully negotiates with the far-end equipment.
Note that Cisco SPA IP phones support voice codec priority. You can select up to
three preferred codecs. The administrator can select the low-bit-rate codec used
for each line. G.711a and G.711u are always enabled.
Scripting for
for syntax information.
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