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 27

This is for redundancy, if registering to Primary SIP server

fails, the IP phone will go to Secondary SIP server for

registering.

Note:Secondary SIPserveris usedforredundancy,itcan be

left blank if there is not 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.

Note: 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solveNATissues.

Note:Bydefault,NATisdisabled.



Akuvox R26C User Manual

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