[Freeswitch-users] Gaps In RTP (wideband) Packets From mod_voicemail

[Jerry Richards]

By the way, in contrast, I created an XML block that plays the same messages as mod_voicemail (see block below).  When this XML block is executed, there is no clipping of words when using wideband codec BV32.  This is why I'm thinking it's related to delays caused by mod_voicemail processing.

    <extension name="test_message">
      <condition field="destination_number" expression="^\*105$">
        <action application="answer"/>
       <action application="sleep" data="1000"/>
              <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-hello.wav"/>
        <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-you_have.wav"/>
              <action application="say" data="en number pronounced 1"/>
        <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-new.wav"/>
        <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-messages.wav"/>
        <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-you_have.wav"/>
              <action application="say" data="en number pronounced 2"/>
        <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-saved.wav"/>
        <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-messages.wav"/>
        <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-listen_new.wav"/>
        <action application="playback" data="/opt/teoswitch/sounds/en/us/callie/voicemail/vm-press.wav"/>
              <action application="say" data="en number pronounced 1"/>
        <action application="sleep" data="100"/>
      </condition>
    </extension>

Thanks,
Jerry

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Jerry Richards
Sent: Thursday, May 10, 2012 8:23 AM
To: FreeSWITCH Users Help
Subject: [Freeswitch-users] Gaps In RTP (wideband) Packets From mod_voicemail

Hello,


I'm seeing a audio problem when listening to the operator when calling into voicemail to listen to messages and a wideband codec is used.  Looking at a wireshark trace, I see gaps between transmitted RTP packets that exceed the jitter buffer depth in the endpoint softphone, causing underflow.   This causes clipping of the front-end of words such as "Pressed" sounds like 'ess' and "Last name" sounds like 'ast name'.  While this is generally not noticeable with the G.711 codec, it causes these clipped audio phrases with wideband codecs, such as BV32.  It might be due to the processing delay in mod_voicemail between phrases?



Has anyone seen this?  Is there a tag to help improve this?



Thanks,

Jerry

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