AltiGen MAXCS 7.0 Update 1 ACM Administration - Manual (Page 329)

Setting VoIP Codec Profiles
MaxCS 7.5 Administration Manual 313
Codec
There are several options:
•
G.711 Mu-Law
•
G.723.1
• G.729
• G.722 (supported on Softswitch and Cloud deployments only)
G.711 provides toll quality digital voice encoding, and G.723 and
G.729 use low rate audio encoding to provide near toll quality
performance under clean channel conditions.
G.722 is a wideband audio codec. It provides higher voice quality
than more narrow-bandwidth codecs such as G.711.
Use the Add and Remove buttons to move codecs between the
Available Codec
and the Selected Codec lists. Codecs you place into
the Selected Codec list will appear in the SDP Codec Capability list
for codec negotiation.
Prioritize the selected codecs by using the Up and Down buttons.
Note: AltiGen IP phones 705, 710, and 720 do not support G.722 or
G.711 A-Law.
G.711 / G.723 / G.729
Silence Suppression
When silence suppression is enabled, and silence is detected during
a call, MAXCS stops sending packets to the other side. This
decreases the bandwidth requirement, however the voice quality may
be degraded slightly. These are system-wide settings.
DTMF Delivery
(Applies to SIP protocol
only)
SIP INFO is used to deliver DTMF.
RFC 2833 – The DTMF pay load is embedded with RTP. Most 3rd-
party SIP gateways support this standard.
Note: The codec profile assigned to the SIP-TIE Trunk must use
RFC 2833 (DTMF) in order to support Polycom phones. We
recommend that you configure a single codec for SIP Trunk
interfaces.
In band – If DTMF tone is delivered over the voice band. It’s not
reliable over G.711 codec and will not work over G.729/G.723 codec
SIP Early Media
(Applies to SIP protocol
and SIP trunk only)
SIP Early Media allows two SIP devices to communicate before a SIP
call is actually established. It is important for interoperability with the
SIP trunk carrier’s PSTN gateway. If SIP Early Media is not checked,
the caller may not hear the exact ringback tone provided by the CO
(the caller may not hear any ringback tone at all).
When using a SIP trunk as a MaxMobile trunk, you must enable the
SIP Early Media
option for the SIP trunk.
Codec Parameter Description