Yeastar Technology MyPBX SOHO V4, Administrator'S Manual

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MyPBX SOHO V4/V5 Administrator's Guide
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· DNS SRV Look Up
Please enable this option when your SIP trunk contains more than one IP
address.
· User Agent
To change the user agent parameter of asterisk, the default is ―MyPBX‖; you
could change it if needed.
2) NAT
Figure 6-60
Note : Configuration of this section is only required when using remote
extensions.
· Enable STUN
STUN (Simple Traversal of UDP through NATs) is a protocol for assisting devices
behind a NAT firewall or router with their packet routing.
· STUN Address
The STUN server allows clients to find out their public address, the type of NAT
they are behind and the Internet side port associated by the NAT with a
particular local port. This information is used to set up UDP communication
between the client and the VoIP provider and so establish a call.
· External IP Address
The IP address that will be associated with outbound SIP messages if the system
is in a NAT environment.
· External Host
Alternatively you can specify an external host, and the system will perform DNS