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1. In the WebUI, click the Settings tab.
2. In the left navigation pane, go to SIP > SIP Profiles
3. Select the relevant SIP Profile.

4. Configure the Session Timer as shown in the figure below.
   Important: The Offered Session Timer value must be equal to or greater than the Minimum Acceptable Value.

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   Caption 0 Figure 1 Configure Session Timer Image Modified

Signaling Group

1. In the WebUI, click the Settings tab.
2. In the left navigation pane, go to Signaling Groups > (relevant SIP Signaling Group).
3. Select the SIP Profile configured above from the SIP Profile selection list.

4. Click Apply

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   Caption 0 Figure 1 Apply Configured SIP Profile Image Modified

Call Flow

After having applied the configuration changes, in the call flow, the Sonus SBC 1000/2000 supports the UPDATE and INVITE  methods for changing the media capabilities. Session Timer (RFC 4028) uses the INVITE or UPDATE as a mechanism for a periodic refresh of SIP sessions.

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You can verify this using the Log Exchange utility — the following diagram depicts a Sonus SBC 1000/2000 to Lync/SBA call with the Session Timer enabled and in effect: