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Go to "Configuration -> Media -> Media Profiles", create a new media profile named "LyncOnly" (of course you can use other name you like);
Make sure that only "PCMU 20ms, PT=0" and "PCMA 20ms, PT=8" are selected;
Set "Enable Silence Suppression" to "Enabled";
Save the media profile.
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3. Outbound Call
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Go to "Configuration -> Signalling -> SIP Trunks", add a new sip trunk;
Get the value of 1-e(Mediation Server IP or FQDN) and 1-b(Mediation Server port), create <ip>:<port> format string, e.g. "lync-demo.sangoma.local:5067", and then fill into "Domain";
Fill in "User Name" and "Password" with dummy string, like "notuse" and "notuse";
Fill in "Transport" with the value from 1-a;
"Options Ping Frequency" = "60";
"Options Max Ping" = "5";
"Options Min Ping" = "1";
In Sip Profile, choose the sip profile created in section 3;
Keep "Registration" to "Disabled"
Save the sip trunk configuration.
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Annex A. Certificates for TLS
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