No Audio or One Way Audio after Transfer or Forwarding

Symptom

  • When you perform the attended-transfer(particularly the SIP REFER method)  by the transfer button on the IP phone for the incoming call. After the transfer of the call, it would have the one-way audio or no audio on both sides for the caller and the transfer target party.
  • The incoming call is forwarded by the extension always forwarding settings.
  • This article also applies to the situation with the calls via SIP trunk become no audio after a specific time like 15 mins.

Solution

1. Try to disable the Allow RTP Re-Invite option in the SIP Advanced setting.

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2. Try to disable the Jitter Buffer for the trunk that involves the forwarding or transfer.

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If this solution doesn't help, try to seek help from our support.

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2 Comments

  • 0
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    This article also applies to the situation with no audio after PBX receives a Re-INVITE from the SIP trunk or external SIP device.

  • 0
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    I came across this article because I got the problem that an incoming call is forwarded by the extension always forwarding settings - the forwarding itself works, but I got no audio.

    I tried the solutions in this article, but nothing worked.

    Maybe there is another suggestion?

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