Specifications

enable this since other DTMF modes require IP PBX being
RTP relay server to support in-line transfer.
DTMF Mode Choose preferred DTMF mode for this extension. Currently
supported types include RFC2833, SIP INFO, and in-band
tone. It must match configuration on the device side.
) In-band DTMF mode consumes the limited DSP
resource when using a highly compressed codec, such
as G.729 or G.723.1. Therefore, calls will not connect
with such setting if DSP is not installed. Although using
a low-complexity codec such as G.711 does not require
DSP, DTMF detection still takes considerable CPU
resource and impacts several system specs. Be
cautious when configuring an extension with in-band
DTMF mode.
Advanced Settings Select to see more optional settings shown below.
(Optional) Select Block Anonymous Calls to block all calls
without a Caller ID.
Selective Call Blocking
(Optional) Block one or more calling numbers by entering
the calling numbers and clicking
. Removing the
blocked numbers by clicking the number from the list, and
then click
.
Block SIP redirection from the
extension
Select to ignore the forward settings of IP phone and honor
the forward settings of IP PBX.
Forward Options
(Optional) Select Unconditional Call Forward and clicks a
default destination in the list, e.g. Voicemail or Phone
Number.
) If selecting Phone Number, enter a number to which
incoming calls are forwarded unconditionally. The
number could be an extension or a PSTN number with
appropriate outbound prefix.
Unavailable Call Forward (Optional) Enter a number to which incoming calls are
forwarded when not answered. The number could be an
extension or a PSTN number with appropriate outbound
prefix.
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