Aastra Telecom 53I, 57I CT, 55I manual Configuring the IP Phones

Configuring Network and Session Initiation Protocol (SIP) Features

Global SIP Settings

Aastra Web UI

Step Action

16(For Broadsoft Servers) The “Blacklist Duration” field is enabled by default with a value of 300 seconds (5 minutes). Valid values are 0 to 9999999.

This feature sets the time period, in seconds, that the IP phone resubscribes the BLF subscription service after a software/firmware upgrade or after a reboot of the IP phone.

Note: The value of “0” disables the blacklist feature.

For information about setting the “Blacklist Duration”, see Chapter 6, the section, “Blacklist Duration (Broadsoft Servers)” on page 6-17.

17Enable the "Whitelist Proxy" field by checking the check box. (Disable this field by unchecking the check box. Default is disabled).

When this feature is enabled, an IP phone accepts call requests from a trusted proxy server only. The IP phone rejects any call requests from an untrusted proxy server.

	For information about setting the “Whitelist Proxy”, see Chapter 6, the section, “Whitelist Proxy” on
	page 6-19.
18	Click	to save your changes.

Configuring the IP Phones

41-001160-00, Release 2.1, Rev 04 4-63