Auerswald COMpact 4000 Operation Manual page 600

Settings
VoIP
VoIP Provider Settings
Notes:
The preset codec sequence can be changed manually if necessary.
If using a codec with high bandwidth (e.g. G.711) causes too much negative
impact on the call quality, it may be that there is not enough connection
bandwidth. If the call quality is impacted frequently, it is a good idea to only
select codecs with lower bandwidths in the Codec settings priority list.
SETTINGS
STUN server IP address or URL
Interval for STUN server query
Requirements:
• IP operating mode IPv4
• NAT traversal Enabled with use of STUN
A STUN server provides information to subscribers on a private network on request. This infor-
mation includes the IP address and port outside their private network that is viewed as the
source of their data. This information is entered in the requests, instead of the actual private IP
address/port.
Notes:
If you encounter problems with unilateral call connections, enabling the RTP
port might help.
The Overviews > Ports page shows an overview of the PBX ports (incoming
and outgoing).
Sub-system operation
Like any other PBX for which the VoIP provider has been configured, the PBX can be used
as a sub-system.
600
Port
Caution: Every time port forwarding is performed, there is a security
risk.
• For this reason we recommend you use this functionality as little
as possible.
COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016