Aastra Telecom 55I, 57I CT, 53I manual Step Action

Configuring Network and Session Initiation Protocol (SIP) Features

Global SIP Settings

Aastra Web UI

Step Action

2Enable the "Explicit MWI Subscription" field by checking the check box. (Disable this field by unchecking the check box. Default is disabled).

If the IP phone has a message waiting subscription with the Service Provider, a Message Waiting Indicator (MWI) (LED or display icon) tells the user there is a message on the IP Phone.

3If you enable the “Explicit MWI Subscription” field, then in the “Explicit MWI Subscription Period” field, enter the requested duration, in seconds, before the MWI subscription times out. The phone re-subscribesto MWI before the subscription period ends. Default is 86400.

4Enable the “Missed Call Summary Subscription” field by checking the check box. (Disable this field by unchecking the check box. Default is disabled).

This feature allows missed calls that have been redirected by the server, to be incremented in the missed calls indicator on the phone it was initially directed to. For more information about this feature, see Chapter 6, “Configuring Advanced Operational Features.”.

Note: The “Missed Call Summary Subscription” feature is configurable on a global or per-line basis.

5If you enable the “Missed Call Summary Subscription” field, then in the “Missed Call Summary Subscription Period” field, enter the amount of time, in seconds, that the phone uses the Missed Calls Summary Subscription feature. Default is 86400.

For more information about this feature, see Chapter 6, “Configuring Advanced Operational Features.”

Note: The “Missed Call Summary Subscription Period” is configurable on a global basis only.

6Enable the “Send MAC Address in REGISTER Message” and the “Send Line Number in REGISTER Message” fields by checking the check boxes.

(Disable these fields by unchecking the check boxes. Default is disabled for both fields).

For more information about these message features, see Chapter 6, “Configuring Advanced Operational Features.”.

7In the "Session Timer" field, enter the time, in seconds, that the IP phone uses to send periodic re-INVITErequests to keep a session alive. The proxy uses these re-INVITErequests to maintain the status' of the connected sessions. See RFC4028 for details.

8In the "Timer 1 and Timer 2" fields, enter a time, in milliseconds, that will apply to an IP phone session. These timers are SIP transaction layer timers defined in RFC 3261.

Timer 1 is an estimate of the round-trip time (RTT). Default is 500 msec.

Timer 2 represents the amount of time a non-INVITE server transaction takes to respond to a request. Default is 4 seconds.

Configuring the IP Phones

41-001160-00, Release 2.1, Rev 04 4-61