"Use of Escape Code""O"" within the E.164 Numbering Plan During the Transition Period to Implementation of NPI Mechanism - Series E: Telephone Network and ISDN Operation Numbering Routing and Mobile Services - International Operation - Numbering Plan of t
This Recommendation describes the use of escape code "O" within the E.164 numbering plan in order to facilitate number plan interworking during the transition period to implementation of the NPI mechanism.