We have Unity 4.0(2) running at the head office. There are multiple remote sites and there are WAN links in place between these sites and the head office. Only the head office has IP Phones and Unity mailboxes. The remote sites have E1 connections from routers into the PABX. These are represented as H.323 gateways in CallManager 3.3(3)SR2.
From one of the remote sites there is a problem when a call is placed to the head office and a message is left on a head office Unity mailbox. The caller will hear the greeting and leave a message, but when the head office user goes to listen to the message, they do not hear anything.
Calls from this remote site to the head office are fine and are using G.729.
Calls from other remote sites where G.729 is used do not encounter this problem.
Re: Unity Voicemail Messages Dropping on G.729 Calls
Are you sure there is a good IP path from the remote site router to Unity. The call setup occurs between the router and Call Manager, and the Call Manager to Unity, but the audio path is direct between the endpoints. You may have a one way audio path.Can you ping Unity from the router?
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
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