47. In a switching system having an internal numbering plan, for use in a telecommunications network having a network numbering plan, the improvement comprising: data storage means for storing (a) first contents defining a syntax and a grammar of the internal numbering plan that includes a first symbol sequence, the first contents defining the first symbol sequence as a feature access code for a corresponding feature, and (b) second contents defining a syntax and a grammar of the network numbering plan that includes a second symbol sequence, the second contents defining the second symbol sequence as an equivalent of the first symbol sequence; means, responsive to receipt from a user directly served by the switching system of the first symbol sequence, for parsing the received first symbol sequence by using the first contents of the data storage means to determine a meaning of the first symbol sequence within the internal numbering plan, and further responsive to receipt of the second symbol sequence, for parsing the received second symbol sequence by using the second contents of the dam storage means to determine a meaning of the second symbol sequence within the network numbering plan; and means responsive to the determined meaning of either one of the received first symbol sequence and the received second symbol sequence for invoking the feature that corresponds to the first symbol sequence.
47. In a switching system having an internal numbering plan, for use in a telecommunications network having a network numbering plan, the improvement comprising: data storage means for storing (a) first contents defining a syntax and a grammar of the internal numbering plan that includes a first symbol sequence, the first contents defining the first symbol sequence as a feature access code for a corresponding feature, and (b) second contents defining a syntax and a grammar of the network numbering plan that includes a second symbol sequence, the second contents defining the second symbol sequence as an equivalent of the first symbol sequence; means, responsive to receipt from a user directly served by the switching system of the first symbol sequence, for parsing the received first symbol sequence by using the first contents of the data storage means to determine a meaning of the first symbol sequence within the internal numbering plan, and further responsive to receipt of the second symbol sequence, for parsing the received second symbol sequence by using the second contents of the dam storage means to determine a meaning of the second symbol sequence within the network numbering plan; and means responsive to the determined meaning of either one of the received first symbol sequence and the received second symbol sequence for invoking the feature that corresponds to the first symbol sequence. 48. The improvement of claim 47 wherein: the second contents define the second symbol sequence same as the first contents define the first symbol sequence; and the invoking means are responsive to the determined meaning of the received first symbol sequence by invoking the feature that corresponds to the first symbol sequence by using the determined meaning and the first contents of the data storage means, and are responsive to the determined meaning of the received second symbol sequence by invoking same said feature by using the determined meaning and the second contents of the data storage means.