No voice transmission if an automated message or call forwarding is active on the receiving site

Thomas Scheffczyk <[email protected]> Tue, 9 Jun 2026 13:16:04 +0200
Newsgroups	gmane.comp.voip.linphone.user
Message-ID	<[email protected]>
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From: Thomas Scheffczyk <[email protected]>
To: [email protected]
Message-ID: <[email protected]>
Subject: No voice transmission if an automated message or call forwarding is
 active on the receiving site

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    <p>Hi all,=C2=A0</p>
    <p>I use Linphone with a Fritzbox 6591 Cable. Registration on the
      Fritzbox works perfectly; incoming calls are forwarded to
      Linphone, and it is possible to call external numbers from
      Linphone - that is, the connection is established and when a
      person answers a call made from Linphone, voice is transmitted.=C2=A0=
</p>
    <p>However, if an automated system (e.g., =E2=80=9Cpress 1 for ...,=E2=
=80=9D =E2=80=9Cpress
      2 for ...=E2=80=9D) answers the call, an automated message plays, o=
r the
      call is transferred on the receiving side, no voice is
      transmitted.<br>
      <br>
      I have changed the following options without any change in
      behaviour:</p>
    <ul>
      <li>Transport (UDP/TCP)</li>
      <li>DTMF send method (SIP info/RFC2833)</li>
      <li>Allow IPv6 (on/off)</li>
      <li>Enable ICE (off/on/on with stun.linphone.org set to 127.0.0.1)<=
/li>
    </ul>
    <p>(Most tests were conducted using Linphone Desktop 5.3.1 (Linux),
      but the issue also occurred in Linphone 6.)</p>
    <p>In a test with Zoiper5 and the same account on the Fritzbox, this
      problem does not occur.=C2=A0<br>
      <br>
      I would appreciate any advice on what I might be overlooking or
      doing incorrectly.=C2=A0<br>
      <br>
      Thanks in advance</p>
    <p>Thomas</p>
    <p><br>
    </p>
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