Question 2/VII - Call progress signals (continuation of Question 3/VII
studied in 1985-88)

considering

(a) that public data transmission services are provided by PDNs and
ISDNs with the various categories of access defined in Recommendation
X.10;

(b) that Recommendations X.1, X.2, X.4, X.10, X.21, X.25, X.28, X.29,
X.30, X.31, X.32, X.75, X.96 and X.301 define all the requirements for
the implementation of the international public data transmission
services,
What call progress signals for PDNs should be added to, or deleted from
Recommendation X.96?

Note - Any necessary clarification of call control signals should be
considered.