Yes that's clear to me that you need to send your certificates. But my question was related with CA certificate. When you read TLS RFC (see below) it seems that sending CA certificate is not mandatory. That is the reason of my question.
certificate_list
This is a sequence (chain) of X.509v3 certificates. The sender's
certificate must come first in the list. Each following
certificate must directly certify the one preceding it. Because
certificate validation requires that root keys be distributed
independently, the self-signed certificate which specifies the
root certificate authority may optionally be omitted from the
chain, under the assumption that the remote end must already
possess it in order to validate it in any case.