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Here is the startup sequence of an IP phone getting a new CA and performing SCEP to get a new certficate signed by the new CA:

GET /---settings---.txt HTTP/1.1 
HTTP/1.1 200 OK  (text/plain)
GET /---logo---.jpg HTTP/1.1 
HTTP/1.1 200 OK  (JPEG JFIF image)
GET /---old-root-ca---.pem HTTP/1.1 
HTTP/1.1 200 OK  (text/plain)
GET /---old-issuing-ca---.pem HTTP/1.1 
HTTP/1.1 200 OK  (text/plain)
GET /---new-issuing-ca---.pem HTTP/1.1 
HTTP/1.1 200 OK  (text/plain)
GET /---new-root-ca---.pem HTTP/1.1 
HTTP/1.1 200 OK  (text/plain)
GET /certsrv/mscep/mscep.dll?operation=GetCACert&message=CAIdentifier HTTP/1.0 
HTTP/1.1 200 OK  (application/x-x509-ca-ra-cert)
GET /certsrv/mscep/mscep.dll?operation=PKIOperation&message=---base64-data--- HTTP/1.0
HTTP/1.1 200 OK  (application/x-pki-message)

This overview has been scrubbed and I can't share more details as the trace contains customer data. But I hope this helps...