vcc_connect
int vcc_connect(struct socket *sock, int itf, short vpi, int vci);
error = vcc_connect(sock, addr->sap_addr.itf, addr->sap_addr.vpi,
error = vcc_connect(sock, vcc->itf, vcc->vpi, vcc->vci);
error = vcc_connect(newsock, msg->pvc.sap_addr.itf,