ATCOM APBX IP2G4A User Manual page 16

APBX IP2G4A User Manual
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, Asterisk will route the media streams from SIP endpoints through itself. Enabling this option causes
asterisk to attempt to negotiate the endpoints to route the media stream directly, bypassing asterisk. It is not always
possible for asterisk 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
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.
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.
15 ATCOM TECHNOLOGY CO., LIMITED