code: def terminating_sip_domains(self):
          
          if self._terminating_sip_domains is None:
              self._terminating_sip_domains = TerminatingSipDomainList(
                  self._version,
                  trunk_sid=self._solution['sid'],
              )
          return self._terminating_sip_domains
docs: Access the terminating_sip_domains
  
          :returns: twilio.rest.trunking.v1.trunk.terminating_sip_domain.TerminatingSipDomainList
          :rtype: twilio.rest.trunking.v1.trunk.terminating_sip_domain.TerminatingSipDomainList