The ASAI-provided digits feature allows an adjunct to include digits in a Route Select capability. The digits are treated as dial-ahead digits for the call. Dial-ahead digits are stored in a dial-ahead digit buffer and can be collected one at a time or in groups using the collect digits command. Although the adjunct can send more than 24 digits in a Route Select, only the first 24 digits (or 24-x, wherex is the number of digits collected by vector processing prior to executing the adjunct routing link vector command) are retained as dial-ahead digits. An application can use this capability to specify the digits that Communication Manager must pass to the VRU as part of the converse-on vector step.