Canon 164

1. To the council of hierarchs must be called all and only

ordained bishops of the metropolitan Church sui iuris wherever

they are constituted, excluding those mentioned in can. 953, 1

or those who are punished with the canonical penalties mentioned

in cann. 1433 and 1434. Bishops of another Church sui iuris can

be invited as guests only if it is acceptable to the majority of

the members of the council of hierarchs. 2. Eparchial bishops

and coadjutor bishops have a deliberative vote in the council of

hierarchs; other bishops of the metropolitan Church sui iuris can

have this vote if this is expressly established in particular

law.