SRTP unsupported crypto offer

[2023-06-23 10:57:44] VERBOSE[1714] res_srtp.c: Unsupported crypto suite: AEAD_AES_256_GCM
[2023-06-23 10:57:44] WARNING[1714] res_pjsip_sdp_rtp.c: Ignoring crypto offer with unsupported parameters: 1 AEAD_AES_256_GCM

FreePBX using pjsip 5061 TLS, RTP 10,000-20,000. Let’s encrypt certificate for the PBX and TLS. Forcing SRTP on extensions.

Phone is able to connect to the PBX using TLS 5061. The endpoint phone Grandstream GXP2170 is configured to use SRTP. When I make a call, the logs show the errors above. That cipher was included in the latest firmware for the phone. It’s one of the many. In the phone itself I cannot find a place where to prioritize ciphers.

How should I go about this? Should I focus on the phone or the PBX? Is there a way I can install this cipher on the PBX server? I can’t seem to find a way to substitute this cipher on the phone itself.

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