All members of SCOBA (a voluntary association of multi-jursidictional Canonical Bishops of Orthodox Churches in the United States) are in full communion with each other in the US. There are jurisdictions that are not members of SCOBA that are recognized as canonical and the SCOBA parishes will commune with the their Laity and clergy if that is their desire (ROCOR is one of these).
All SCOBA Bishop and Clergy will serve at the same Holy Table during a Divine Liturgy.ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š At Present, ROCOR Bishops and Clergy will only serve at the same Holy Table with Bishops/Clergy of the Patriarchate of Jerusalem (also represented in SCOBA),Bishops /Clergy of the Patriarchate of Serbia (also represented in SCOBA), and the True Orthodox Church of Greece (not in SCOBA and not in communion with most Orthodox Churches).ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š It should be noted that ROCOR has chosen to not serve or be formally in communion with other Jurisdictions after it left SCOBA as a witness that they feel the other Orthodox Churches are not practicing Orthodoxy as it should be practiced. Of interest, currently they are in negotiations with the Moscow Patriarchate to re-enter formal communion butÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š both parties still note that this is not a done deal yet. ROCOR priests will usually commune other jurisdiction's laity if they have confessed to the ROCOR priest prior to communing (just as they require all ROCOR Laity to do)---in other words they recognize the Baptism of the non-ROCOR layperson who is another canonical Orthodox jurisdiction.
So in Short, as Lay person, you should have no problems going to any of the canonical jurisdictions in the United States if you follow these steps:
1) Remember to always bring your baptismal certificate and if possible a letter from your pastor confirming you are in full communion whenever you are visiting another parish.
2) Before going to a Liturgy in which you wish to commune, make personal contact with the priest of the parish you are wishing to commune in to verify what he requires for you to commune.
3) Know that different jurisdictions and priests have specific requirements you must meet
ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š a)ROCOR policy is generally you must attend the vigil the night before the Divine Liturgy and have confessed within the last 7 days---some priest will require you to confess with them so they know you have had confession within the last 7 days
ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š b)TheÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š Greek Orthodox Church and the Antiochian Orthodox Church encourage frequentÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š communion and frequent confession but only required confession twice a year---once during Lent and once during Nativity Lent also they require Laity to commune at a minimum at Pascha and Nativity.
ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š ÃƒÆ’Ã¢â‚¬Å¡Ãƒâ€š c) Slavic Churches like the OCA, Moscow Patriarchate, Serbian Orthodox Church, etc also expect confession before any communion and most of the Laity do not generally commune frequently .
I hope this helps.