Configuring The Cisco Versions Of The G.726 Codecs; Configuring Dtmf Relay - Patton electronics SmartWare R.3.20 Software Configuration Manual

SmartWare Software Configuration Guide
Mode: Profile VoIP
Step
node (pf-voip)[ name ]#codec 1 g729 tx-
1
length 30 rx-length 30 silence-
suppression
Configuring the Cisco versions of the G.726 Codecs
The Cisco versions of codecs are listed in the previous section as separate codecs with their name ending in –
cisco. SmartWare supports four Cisco codec versions: g726-16k-cisco, g726-24k-cisco, g726-32k-cisco,
and transparent-cisco. Three of the codecs are variations of G.726, the fourth is transparent-cisco.
The transparent-cisco codec provides full compatibility with Cisco's clear-channel codec used for transmission of
Unrestricted Digital Information over a VoIP (SIP or H.323) network.
Cisco does not use the standard ITU G.726 version of G.726, instead it uses the ATM AAL2 version.
All supported Cisco codecs are available in profile voip.
Mode: VoIP name
Step Command
node (pf-voip)[ name ]#codec { g726-16k-cisco |
1
g726-24k-cisco | g726-32k-cisco | ... }
The next table indicates the method of configuring a Cisco-variant codec as the most preferred codec. This
example sets the 'transparent-cisco´ as number 1, the most preferred.
Mode: VoIP name
Step Command
node(pf-voip)[ name ]#codec 1 transparent-cisco Configures transparent-cisco as the most
1
Configuring DTMF relay
Dual tone multi-frequency (DTMF) tones are usually transported accurately in band when using high bit-rate
voice codecs such as G.711. Low bit-rate codecs such as G.729 and G.723.1 are highly optimized for voice pat-
terns and tend to distort DTMF tones. The
transporting DTMF tones out-of-band or separate from the encoded voice stream as shown in
H.323 signals the DTMF tones as H.245 user input indications, SIP uses a mechanism of RTP to reliably
transport tones (according to RFC2833).
VoIP profile configuration task list
Command
dtmf relay
40 • VoIP profile configuration
Purpose
Inserts codec g729 at the first position of the list
(most preferred codec). The parameters are the
same previously described.
If the codec g729 had yet existed in the list, it is
moved to the first position of the list, adopting the
entered parameter values.
Purpose
To operate with Cisco's G.726 codecs.
Purpose
preferred codec.
command solves the problem of DTMF distortion by
figure 79.
511