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Echo control is essential for packet-switched networks to carry voice traffic successfully. The Cisco AS5400XM Universal Gateway
conforms to the voice tests of ITU-T Recommendation G.168 2002 for echo cancellation with a tail length up to 64 ms. Fixed and
adaptive jitter buffering and comfort-noise generation further enhance voice quality. The Cisco AS5400XM also supports the enhanced
measurements and call-specific debug features in Cisco IOS Software. In addition, the user can set items such as IP-side attenuation down
to the individual T1 or E1 voice port.
Voice Codecs
The Cisco AS5400XM Universal Gateway offers multiple codecs to meet interoperability, compression, and latency requirements for
a variety of voice applications. The Cisco AS5400XM High-Density Packet Voice/Fax Feature Card (AS5X-FC) provides complete
flexibility in channel allocation to achieve highest densities. Each voice/fax feature card supports from one to six high-density DSP
modules (AS5X-PVDM2-64) providing scalability from 64 to 384 channels. Enabling voice activity detection (VAD) reduces packet
traffic through the network. With VAD enabled, the Cisco AS5400XM detects silence and stops transmitting packets when callers stop
speaking. Variable frame sizing provides further control over speech packetization.
The Cisco AS5400XM Universal Gateway supports the voice codecs listed in Tables 1 and 2.
Table 1. Codec Support: Cisco AS5400XM High-Density Packet Voice/Fax Feature Card
DSP Feature Card Low-Complexity Codecs Medium-Complexity Codecs High-Complexity Codecs
Cisco AS5400XM High-Density
Packet Voice/Fax Feature Card
(AS5X-FC) with 6 DSP module
(AS5X-PVDM2-64) slots
●
G.711 mu-law
●
G.711 a-law
●
Fax pass-through
●
Modem pass-through
●
Clear channel codec
●
G.729 a
●
G.729 ab
●
G.726 16K, 24K, 32K
●
T.38 Fax Relay
●
Cisco Fax Relay
●
Adaptive multirate-narrow Band
(AMR-NB) 4.75K, 5.15K, 5.9K, 6.7K,
7.4K, 7.95K, 10.2K, 12.2K, silence
indicator (SID)
●
G.723.1 5.3K, 6.3K
●
G.723.1A 5.3K, 6.3K
●
G.728
●
Modem relay
●
Internet Low-Bitrate Codec (iLBC)
Maximum channel capacity
per feature card (AS5X-FC)
384 192 144
Table 2. Codec Support: Cisco AS5400XM Universal Gateway with the Universal Port Feature Card
DSP Feature Card Codecs
Cisco AS5400XM Voice/Universal Port Feature Card
(AS5XM-VUFC-108NP and AS5XM-VUFC-60NP)
●
G.711 mu-law
●
G.711 a-law
●
Fax pass-through
●
Modem pass-through
●
Clear channel codec
●
G.723.1 5.3K, 6.3K
●
G.726 16K, 24K, 32K
●
G.729ab, G729a
●
Global System for Mobile Communications - Full-Rate (GSM-FR)
●
T.38 Fax Relay
Maximum channel capacity per universal port feature
card for all codec types
●
60 per AS5XM-VUFC-60NP
●
108 per AS5XM-VUFC-108NP
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