PLANET VIP-1010PT - Manual (Page 43)

High Definition PoE IP Phone (1-Line)
VIP-1010PT
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This is for redundancy; if registering to Primary SIP server
fails, the IP phone will go to Secondary SIP server for
registration.
Secondary SIP server is used for redundancy;
it can be left blank if there is no redundancy
SIP server in user’s environment.
Outbound Proxy
Server To display and configure Outbound Proxy server settings.
An outbound proxy server is used to receive all initiating
request messages and route them to the designated SIP
server.
If configured, all SIP request messages from
the IP phone will be sent to the outbound
proxy server forcefully.
Transport Type To display and configure Transport type for SIP message
UDP: UDP is an unreliable but very efficient transport
layer protocol.
TCP: Reliable but less-efficient transport layer protocol.
TLS: Secured and Reliable transport layer protocol.
DNS-SRV: A DNS RR for specifying the location of
services.
NAT To display and configure NAT (Net Address Translator)
settings.
STUN: Short for Simple Traversal of UDP over NATS, a
solution to solving NAT issues; by default, NAT is disabled.