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8-8
Cisco Unified Communications Manager Administration Guide
OL-18611-01
Chapter 8 Region Configuration
Configuring a Region
Table 8-2 Bandwidth That Audio Codecs Use
Audio Codec
Bandwidth Used Per Call
(Including IP Headers) With
30-ms Data Packets
Description
G.711 80 kb/s This codec represents the default codec for all
Cisco Unified Communications Manager calls.
G.722 80 kb/s Video endpoints typically prefer this codec.
G.723 24 kb/s The system supports this low-bit-rate codec for
use with older Cisco IP Phone 12 SP Series and
Cisco IP Phone 30 VIP.
G.728/iLBC 26.66 kb/s for G.728
24 kb/s for iLBC
Video endpoints support the G.728 low-bit-rate
codec.
Internet Low Bit Rate Codec (iLBC) enables
graceful speech quality degradation in the case of
lost frames and is suitable for real-time
communications.
G.729 24 kb/s The system supports this low bit-rate codec for
Cisco Unified IP Phone 7900.
Wideband/AAC 272 kb/s The system supports this high-quality,
high-bandwidth audio codec for IP-phone-to-
IP-phone calls that the Cisco Unified IP Phone
7900 supports.
Use this audio codec if you want to configure the
Advanced Audio Codec (AAC) for calls between
phones that are running SIP.
Advanced Audio Codec (AAC) specifies a
wideband voice codec that provides improved
voice fidelity and equal or better sound quality
over older codecs.
GSM 29 kb/s The Global System for Mobile Communications
(GSM) codec enables the MNET system for GSM
wireless handsets to interoperate with Cisco
Unified Communications Manager.