Auerswald COMpact 4000 Operation Manual page 589

QUALITY OF SERVICE (QOS)
DiffServ
Requirements:
• Existing and enabled DiffServ support on all active network components
DiffServ is used to prioritise the handling of language packages (VoIP) and to achieve better
voice quality for VoIP calls. DiffServ can be evaluated in networks that include active network
components, such as routers or switches, to enable packets to be forwarded in accordance with
their priority.
As proposed in RFC 4594, the DSCP values are set for VoIP calls (signalling (SIP): CS5,
voice (RTP): EF).
Notes:
DiffServ is not usually supported by VoIP providers. As a result, this setting
may not be taken into consideration under certain circumstances on the
Internet.
To adopt the change, reboot the PBX.
STUN SERVER FOR CONNECTING EXTERNAL VOIP SUBSCRIBERS
STUN server IP address or URL
Port
Requirements:
• support for public DNS mapping by the router on the PBX network
• call forwarding from the SIP port of the internal VoIP registrar to the PBX's IP address in the
router
• configured DNS server
The STUN server entered here can be used to connect to external private branch
exchanges.
Notes:
If all external private branch exchanges are connected to the PBX network
via a VPN tunnel, no STUN server needs to be entered.
COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016
Settings
VoIP
VoIP Settings
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