Canon 102

1. All and solely ordained bishops of the patriarchal Church

wherever they are constituted, excluding those mentioned in can.

953, 1 or those who are punished by canonical penalties mentioned in cann. 1433 and 1434, must be called to the synod of

bishops of the patriarchal Church. 2. With regard to eparchial

bishops constituted outside the territorial boundaries of the

patriarchal Church and titular bishops, particular law can restrict their deliberative vote, with due regard for the canons

concerning the election of the patriarch, bishops and candidates

for office mentioned in can. 149. 3. To expedite certain matters, according to the norm of particular law or with the consent

of the permanent synod, others can be invited by the patriarch,

especially hierarchs who are not bishops and experts to give

their opinions to the bishops gathered in the synod with due regard for can. 66, 2.