Calls fail when opus is the only codec, soft phones ok

Telnyx now supports opus, it’s enabled in Telnyx and freepbx 17 as the only codec.
If I place a call using sangoma soft phone the calls through and uses opus on both ends. Make the same call same user using a desk phone and it fails. Tried with poly VVX450 with opus enabled and also Cisco 8861.
It’s weird it works with soft phones but not desk phones.

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