The Recommendation describes that when calls are circulated over international routes for which accounting rates have not been established, these calls shall be treated in the international accounts as if they had been sent via the primary route.
ITU-T D.172 SPANISH-1993 history
1993ITU-T D.172 SPANISH-1993 ACCOUNTING FOR CALLS CIRCULATED OVER INTERNATIONAL ROUTES FOR WHICH ACCOUNTING RATES HAVE NOT BEEN ESTABLISHED