- PBX Model: P-Series, S-Series
- Avaya model: J100 series
Avaya J129 phone is registered to p550, use Avaya phone A to call Avaya phone B, answer the call, and work normally. Hold the call, and then release the hold, the call is disconnected.
Disable OPUS on the Avaya phone settings.
Move out the OPUS from the codec list.