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14 Updates to Cisco AS5300 Universal Access Server Module Installation and Software Configuration Guides
Software Features
CODECs
Some new compression/decompression (CODECs) has been added to the Cisco AS5300 universal
access server. The following table lists the available CODECs with their default packet size (in
bytes) and their ranges.
High-Density DSPs
The Cisco AS5300 universal access server DSP/voice modules support the following sessions:
• 542 DSP/voice module (AS53-6VOX) supports 6 voice/fax sessions.
• 549 DSP/voice module (AS53-VOXD) supports 12 voice/fax sessions.
Caution A Cisco AS5300 universal access server can support up to 10 modules of either AS53-6VOX or
AS53-VOXD, but it cannot support both.
DTMF-Relay
DTMF is the tone generated when pressing a digit on a touch-tone phone. This tone is compressed
at one end of a call and when it is decompressed at the other can become distorted, depending on the
CODEC used. The DTMF-relay feature transports DTMF tones generated after call establishment
out-of-band viaa standard H.323 out-of-band method and a proprietary, RTP-based mechanism. The
principal advantage of this feature is that it transmits DTMF tones with greater fidelity than is
possible in-band for most low-bandwidth CODECs such as G.729 and G.723. Without the use of
DTMF-relay, calls established with low-bandwidth CODECs may have trouble accessing automated
DTMF-based systems such as voicemail, menu-based ACD systems, automated banking systems,
and so on.
DTMF-relay is disabled by default when a dial-peer is created.
Table 1 Available CODECs
CODECs Range
1
1 The Range and Default figures refer to packet sizes in bytes.
Default Bit Rate Comments
G.711ulaw 40 - 240 160 64 Kbps A separate CODEC for G.729 Annex B is
included, which adds Annex B functionality to
G.729 and a separate CODEC G.723.1 Annex A
adds Annex A functionality to G.723.1.
The Annex B functionality added to G.729 and
the Annex A functionality added to G.723.1 are
the in-built CODEC specific VAD/CNG
functions.
G.711alaw 40 - 240 160 64 Kbps
G.723r63 24 - 240 24 6.3 Kbps
G.723r53 20 - 240 20 5.3 Kbps
G.723ar63 24 - 240 24 6.3 Kbps
G.723ar53 20 - 240 20 5.3 Kbps
G.726r32 20 - 240 40 32 Kbps
G.726r24 15 - 240 30 24 Kbps
G.726r16 10 - 240 20 16 Kbps
G.728 10 - 240 10 16 Kbps
G.729br8 10 - 240 20 8 Kbps
G.729r8 pre-ietf 10 - 240 20 8 Kbps
G.729r8 10 - 240 20 8 Kbps