Conference Voice Quality Issue after firmware upgrade to

Relates to: Yeastar S50

Firmware Version:


After upgrade to I noticed a very poor voice quality on conference.

The voice is distorted, broken and choppy.

The problem appears only when we are using conference, after selecting the conference number and entering the PIN code.

Other SIP trunks works good. Sound is perfect.


Codecs checked

No problem with Internet Connection

No problem with router

Settings checked with our provider

Firewall rules checked


Any ideas ?


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