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Cisco Bug: CSCut59542 - Phone sends BYE due to crypto mismatch in SRTP

Last Modified

Mar 06, 2018

Products (1)

  • Cisco Unity Connection

Known Affected Releases


Description (partial)

Any phone like DX650/DX80 which supports multiple ciphers along with AES_CM_128_HMAC_SHA1_32 may send crypto tags other than 1 to connection, so if CUC sends cryto tag 1 in 200 OK, crypto mismatch occurs since tag is also a negotiated parameter, hence call is terminated.

Early offer configured at CUCM , hence phone sends an early media to CUCM and CUCM to CUC
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