Siemens Gigaset SX541 WLAN dsl Manual page 108

Configuring the Advanced Settings
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Select Other from the Service provider from the selection menu.
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Enter the data you have been given by your service provider:
User name, Displayed name, Phone number, Password, SIP domain, SIP realm,
Proxy server address and Registrar server address.
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Leave the default settings for the parameters SIP listen port, Proxy server port,
Registrar server port and Voice codecs unless you have been given other data by
your service provider.
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Click OK button to apply the settings.
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