When using Lync to terminate outbound to FreeSWITCH, remember by default Lync will CANCEL the call if it does not get 183 progress within 10 seconds. Reason is some stuff about ICE/NAT traversal and missing the first second of audio. (Also realise Lync will try to use ICE, so if you're on a VPN with a similar subnet, it'll pick that path over others. Only way to fix is to firewall off RTP from the Lync server, so that ICE fails. This is the only time I've seen ICE work, and then it resulted in horrible audio quality (RTP over SSL VPN)). -Michael From: freeswitch-users-bounces@lists.freeswitch.org [mailto:freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Shawn Yu Sent: Tuesday, May 08, 2012 11:34 AM To: freeswitch-users@lists.freeswitch.org Subject: [Freeswitch-users] Freeswitch + Lync We have Lync in our environment, and have successfully configured the following to work with Freeswitch: - Outbound call from Lync via Freeswitch - Inbound call rings both Lync and Freeswitch endpoint (Polycom phone) - Calls between Lync and Polycom phone We would also like to have Lync to remote call control the Polycom phone. Is this possible? Shawn