Specifications

Advanced Settings Select to see more settings shown below.
DTMF Mode
Select a preferred DTMF mode, RFC 2833 or SIP INFO, for
this trunk in the list. This must match configuration on the
server side. If the user does not know the DTMF mode on
the server side, select Not Sure from the list, and SDP will
automatically detect the DTMF mode is Inband or RFC2833.
Try Peer-to-peer RTP
Click NO to disable or IP PBX will attempt to notify the two
peers in a conversation to try peer-to-peer RTP
transmission. This is suggested as long as phone and ITSP
side support INVITE or UPDATE method during a connected
call to save the resource of IP PBX. However, only SIP INFO
DTMF mode should enable this since other DTMF modes
require IP PBX being RTP relay server to support in-line
transfer.
Bandwidth Sensitive Indicate the trunk is over a bandwidth-sensitive link, e.g.
across Internet.
Bandwidth Limitation Leave it blank to disable or, specifies a limit of bandwidth in
kbps for call admission.
SIP Domain Specify the SIP domain used by the proxy and registrar. If
not specified, IP address will be used as the domain by
default.
User-agent Content Override default User-Agent header content.
Call Admission Control Select to enable the limitation of concurrent calls for a SIP
trunk
Allow <number> concurrent call(s)
When selecting Call Admission Control, enter a number
for allowed concurrent calls.
Enable ENUM Resolution Select to use ENUM resolution, or leave it as blank.
Clear Bindings Prior Registration Select if failed to the registration, and cannot identify any
abnormal settings.
Disable NAT Traversal IP PBX uses NAT traversal for outgoing traffics by default.
Select to disable NAT traversal if there is a machine that
could handle NAT issues.
Gateway Trunk Select to loose the checking of incoming calls.
Delay Before/After Answering Delay in seconds before and after answering a call from
PSTN trunk.
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