VTech ET685 Administrator And Provisioning Manual page 131

Setting
NAT Identity Settings:
Offer ICE
STUN server
(IP-addrport)
STUN interval (seconds)
Keepalive interval
(seconds)
Web User Interface (WebUI) Reference
ET685 Administrator and Provisioning Manual
Description
Choose whether or not you want to use ICE (Interactive
Connectivity Establishment). ICE optimizes the media path.
This would be the case, for example, when two phones in
the same network are calling each other via a long media
path through other, external networks. With ICE, the short
media path in the same network would be chosen, which will
presumably have better quality than the long one.
Sometimes this feature will stop you from being able to
make calls. When this occurs, switch it off. Note, that ICE
currently will work reliable in OCS environment only.
We reintroduced a STUN keep-alive mechanism for SIP,
which can be turned on manually by specifying the address
of the STUN server followed by the port number. However,
we strongly discourage you from using it, because it can not
work properly in symmetrical NAT environments (i.e.,
linux-based router/firewall). The only general SIP NAT
solution is a session border controller (SBC) on the service
provider's side.
Sets the STUN interval time in seconds. After its expiration
a new STUN requests will be send out. If it results in another
IP/port the identity will be re-registered.
Specifies the number of seconds after which a new
keepalive message will be sent out to the Registrar/Proxy
port in order to have the port stay open and the phone
remain reachable.
131
Back to Contents