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If you’re experiencing audio problems with your Poly phones—including the CCX440, CCX500, and E100—you’re not alone. A certain issue with SIP accounts connected to Freeswitch PBX can cause frustrating silence during calls. Here’s a straightforward guide for resolving these audio problems.
Start by understanding the root cause. When using Opus codec, the payload type is set at 121. However, Freeswitch operates using a dynamic payload type for Opus. This mismatch can result in audio failure because Freeswitch expects a different type and defaults to a standard codec.
To fix this, follow these simple steps:
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Adjust Codec Settings: Begin by removing all codecs from the priority list on your CCX phone, except for Opus. This ensures that Opus becomes the sole codec in use.
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Make a Test Call: Use another SIP client to make a call to your CCX phone through Freeswitch.
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Answer the Call: Pick up the call on the CCX phone.
- Check the Connection: If the call connects but you hear silence, check the Freeswitch logs. You may see messages like “alternate payload received (received 121)” and “Could not change to payload type 121.” This confirms the codec mismatch.
It’s worth noting that this issue persists even with the latest software versions and after resetting the phones to factory settings.
In conclusion, taking these steps can help resolve the audio issues you’re facing with your Poly phones. If problems still occur, consider reaching out to your SIP provider for further assistance or potential configuration adjustments. With these solutions, you’ll improve the calling experience on your Poly devices.
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