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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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Click Apply
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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:
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