NOTICE[11389]: rtp.c:1808 ast_rtp_read: Unknown RTP codec 100 received from

I've found that trying several times may work, but I also read changing your Sipura VOIP adapter settings as follows helps (but it still fails for me sometimes):

In adapter change the following under SIP/Advanced

Codec to G711a from G711u
Passthru Method from: NSE to ReINVITE

FAX CED Detect Enable: Yes
FAX CNG Detect Enable: Yes
FAX Passthru Codec: G711a
FAX Codec Symmetric: Yes
FAX Passthru Method: ReINVITE
Fax Process NSE: yes

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