ATCOM IPPBX IP04 User Manual page 48

IPPBX IP04 User Manual
RTP Port Min / Max
Set the RTP port range.
DTMF Mode
Set the default DTMF mode
2) NAT
Here provide other two solutions for SIP one-way-audio issue besides outbound proxy. Using any one is OK.
a. STUN
Just setting STUN server / port is OK.
There are many public STUN server on Internet: http://www.voip-info.org/wiki/view/STUN
b. NAT
The External IP, External Host and Local Network Identification settings are used if you use IPPBX behind a NAT
device to communicate with services on the outside.
External IP address
Address that we're going to put in outbound SIP messages if we're behind a NAT. The externip and localnet is
used when registering and communicating with other proxies that we're registered with.
External Host
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