code: public OvhDefaultIpRestriction telephony_defaultIpRestriction_POST(String subnet, OvhProtocolEnum type) throws IOException {
  		String qPath = "/me/telephony/defaultIpRestriction";
  		StringBuilder sb = path(qPath);
  		HashMap<String, Object>o = new HashMap<String, Object>();
  		addBody(o, "subnet", subnet);
  		addBody(o, "type", type);
  		String resp = exec(qPath, "POST", sb.toString(), o);
  		return convertTo(resp, OvhDefaultIpRestriction.class);
  	}
docs: Create a default IP restriction for your future VoIP lines
  
  REST: POST /me/telephony/defaultIpRestriction
  @param subnet [required] The IPv4 subnet you want to allow
  @param type [required] The protocol you want to restrict (sip/mgcp)