APBX IP02 User Manual
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ATCOM TECHNOLOGY CO., LIMITED
NAT
Try this setting when APBX is on a public IP, communicating with devices hidden behind a NAT device (broadband
router). If you have one-way audio problems, you usually have problems with your NAT configuration or your
firewall’s support of SIP+RTP ports.
Can Reinvite
By default, APBX will route the media streams from SIP endpoints through itself. Enabling this option causes APBX
to attempt to negotiate the endpoints to route the media stream directly, bypassing APBX. It is not always possible for
APBX to negotiate endpoint-to-endpoint media routing.
DTMF Mode
Select DTMF sending mode, there are three modes:
rfc2833
,
inband
,
info
. The DTMF setting in here should be as
same as that in SIP phone, otherwise APBX will not detect the users’ input correctly during a call.
Auto
means IPPBX will match anyone of them according to the setting of SIP phone.
Preferred Codec
Set the allowed codec and priority for SIP phone. The options are below:
A-law
,
U-law
,
GSM
,
SPEEX
,
G726
,
G722
,
ADPCM
,
G729
IP Restriction
Enable it to permit trusted IP/network register to this extension number. This is an useful way to improve the security
of APBX.
NOTE: There must be at least one same codec chose in APBX extension settings and SIP phone codec
settings, otherwise, It’s impossible to make calls between APBX and SIP phone.
