It's not specified in the documentation, but it's common as a best practice to use 4096 nowadays.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X14-3/cert_creation_use/exwy_b_cisco-expressway-certificate-creation-and-use-deployment-guide-x14-3/exwy_m_generating-a-certificate-signing-request.html
Certificates with Key Length of 8192 Bits
SIP TLS zones may fail to become active if certificates use a key length of 8192 bits. We recommend using certificates with a key length of 4096 bits.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/exwy_b_certificate-creation-use-deployment-guide/exwy_b_certificate-creation-use-deployment-guide_chapter_01000.html
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/config_guide/X12-5/exwy_b_certificate-creation-use-deployment-guide/exwy_b_certificate-creation-use-deployment-guide_chapter_01000.html#:~:text=We%20recommend%20using%20certificates%20with%20a%20key%20length%20of%204096%20bits.
SIP TLS zones may fail to become active if certificates use a key length of 8192 bits. We recommend using certificates with a key length of 4096 bits.
Answer is D - https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-9/Cisco-Expressway-Certificate-Creation-and-Use-Deployment-Guide-X8-9.pdf
recommend using
certificates with a key length of 4096 bits.
upvoted 3 times
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