'Access the credentials
:returns: twilio.rest.api.v2010.account.sip.credential_list.credential.CredentialList
:rtype: twilio.rest.api.v2010.account.sip.credential_list.credential.CredentialList'

@property
def credentials(self):

    if (self._credentials is None):
        self._credentials = CredentialList(self._version, account_sid=self._solution['account_sid'], credential_list_sid=self._solution['sid'])
    return self._credentials
