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Lync and Exchange Unified Messaging - Garbled / Distorted / Poor Quality Voicemail Messages when Simultaneous Ring is enabled RRS feed

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    Hey,

    This issue took me a while to figure out so I thought I would share it with everyone. We had a customer who were reporting intermittent garbled voice mail messages. At first we couldn't replicate it until I realised that it only occurred when Lync simultaneous ring is enabled. Once I figured that out I noticed that VoIP security setting on the UM dial plan was set to "SIP Secured", compared with what we would normally use "Secured". Changed it and the problem disappeared!!

    I have scoured the internet and cannot find and reason why this would occur, but I am happy that at least now the problem is resolved :)

    Thanks,
    Andrew

    Tuesday, September 17, 2013 8:17 PM

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    Hi Andrew,

    Thank you for sharing the solution.

    The VoIP Security option Secured was used so that both SIP signaling traffic and RTP media traffic will be transmitted between Lync and Exchange using encrypted TLS communications.  Opting to use the SIP Secured setting would only protect the SIP traffic using TLS while all RTP traffic would be transmitted over TCP.

    Kent Huang
    TechNet Community Support

    • Proposed as answer by Kent-Huang Thursday, September 19, 2013 1:44 AM
    • Marked as answer by Kent-Huang Thursday, September 26, 2013 2:22 AM
    • Unmarked as answer by Andrew MorpethMVP Thursday, September 26, 2013 2:56 AM
    • Unproposed as answer by Andrew MorpethMVP Thursday, September 26, 2013 2:56 AM
    • Marked as answer by Andrew MorpethMVP Thursday, November 7, 2013 9:25 AM
    Thursday, September 19, 2013 1:44 AM

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    Hi Andrew,

    Thank you for sharing the solution.

    The VoIP Security option Secured was used so that both SIP signaling traffic and RTP media traffic will be transmitted between Lync and Exchange using encrypted TLS communications.  Opting to use the SIP Secured setting would only protect the SIP traffic using TLS while all RTP traffic would be transmitted over TCP.

    Kent Huang
    TechNet Community Support

    • Proposed as answer by Kent-Huang Thursday, September 19, 2013 1:44 AM
    • Marked as answer by Kent-Huang Thursday, September 26, 2013 2:22 AM
    • Unmarked as answer by Andrew MorpethMVP Thursday, September 26, 2013 2:56 AM
    • Unproposed as answer by Andrew MorpethMVP Thursday, September 26, 2013 2:56 AM
    • Marked as answer by Andrew MorpethMVP Thursday, November 7, 2013 9:25 AM
    Thursday, September 19, 2013 1:44 AM
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    Thanks Kent, still it doesn't explain why the voice mail messages ended up garbled. Weird!!

    Andrew Morpeth
    Lync Server Specialist - Auckland, NZ
    Check out my blog

    Thursday, November 7, 2013 9:21 AM