Some Yealink phones (T34, T44), aren't able to properly negotiate SRTP and there is no audio (or white noise) when they are configured in SRTP.
BTW, following Yealink documentation, limiting srtp cypher to AES_CM_128_HMAC_SHA1_80 and AES_CM_128_HMAC_SHA1_32 audio works.
So the workarond now is to only use those two cypher on Tancredi. In the meantime a support ticket with Yealink has been opened and maybe they could fix the issue later.
Some Yealink phones (T34, T44), aren't able to properly negotiate SRTP and there is no audio (or white noise) when they are configured in SRTP.
BTW, following Yealink documentation, limiting srtp cypher to AES_CM_128_HMAC_SHA1_80 and AES_CM_128_HMAC_SHA1_32 audio works.
So the workarond now is to only use those two cypher on Tancredi. In the meantime a support ticket with Yealink has been opened and maybe they could fix the issue later.