Avaya DECT R4 Installation And Administration Manual page 265

Communication Manager system administration
1. Use the SAT command as follows
display-system parameters customer options.
2. Verify whether sufficient H.323 trunk and IP station capacity are available.
3. Verify whether Media Encryption over IP is enabled.
4. Next, verify whether private networking is enabled.
5. On the signaling group page, set Media Encryption =Y
6. Set H.235 Annex H Required = Y
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Avaya DECT R4 - Installation and Maintenance Guide 02/2016