Bad Voice Quality Happens when Calling from Linkus to Grandstream IP Phone

Applicability

  • Firmware version: Any
  • Model: Linkus, Grandstream

Problem Description:

The calls from Linkus to Grandstream Phone exist a bad voice quality issue. The voice hears well if calls between Linkus. Also, calls from IP phone to IP phone are working.

Analysis:

Transcoding problem between iLBC to other codecs, all that seems the voice codes issue.

  • Capture the SIP packet on PBX, and reproduce the issue.
  1. make a call between Linkus and SIP phone.
  2. make a call between SIP phones.

Download the packet, it shows the iLBC Frame Size is using 30ms, And the Linkus mode is 20ms

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Solution:

Access the Grandsteam SIP phone WEB, and change the iLBC Frame Size to 20ms. Or remove iLBC codec.

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