Failed: 405 Method Not Allowed / SIP trunk disallows REGISTER

[ankit.lathigara1]

I Have DX80 Installed and Configured on CUCM, Rather than Registering on CUCM i think it is going for Registration on VCS with Following Error "Failed: 405 Method Not Allowed / SIP trunk disallows REGISTER"

[ahalwan]

You can change the SIP port on the SIP Trunk Security Profile that is applied to the existing SIP trunk configured in CUCM and the Expressway-C neighbor zone for CUCM

You can check this article

https://www.cisco.com/c/en/us/support/docs/unified-communications/expressway/118798-technote-cucm-00.html#anc16 

[b.winter]

Where do you want to register the DX80 in the first place? On CUCM or in Expressway?