D-Link DVG-2032S User Manual page 31

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Enable Support of SIP Proxy Server / Soft Switch: Enable the functions to inter-work with
Proxy Server / Soft Switch. When SIP Proxy 1 and 2 are enabled, the system will register to
SIP Proxy 2 after all lines are failed to register to SIP Proxy 1. SIP Proxy 2 is a backup
system.
Proxy Server IP/Domain: Enter the Proxy Server IP address or URL (Uniform Resource
Locator). You can set 3 redundant Proxy spread by semicolon.
EX: 61.123.231.1;12.34.56.78;proxy.sip.sip
Proxy Server Port: Enter the Proxy Server listen port number. (The factory default value is
5060)
Proxy Server Realm: Enter the correct registered Proxy Server Realm name to avoid
registration failure. If you fail to make a call, please contact your ITSP.
TTL: Enter the desired time interval at which the gateway will report to you Proxy Server.
SIP Domain/Use Domain to Register: Enter the correct SIP domain to avoid registration
failure (it is not necessary to set with some Proxy Servers). If you enable "Uses Domain to
Register" the gateway will register to Proxy with the domain name you filed. Else, the
gateway will register to a Proxy with the IP it resolves. If you fail to make a call, please
contact your ITSP.
Bind Proxy Interval for NAT: This function is able to keep the binding is existed when the
gateway is behind NAT and SIP Proxy is not able to keep the binding.