Akuvox E21 Series - SIP Sever 1; SIP Sever 2; Outbound Proxy Server

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3.3.2. SIP Sever 1
Server IP: To enter SIP server’s IP address or URL.
3.3.3. SIP Sever 2
Server IP: To display and configure Secondary SIP server
settings. This is for redundancy, if registering to Primary SIP
server fails, the IP phone will go to Secondary SIP server for
registering.
3.3.4. Outbound Proxy Server
An outbound proxy server is used to receive all initiating
request messages and route them to the designated SIP
server.