Basically, in some countries, regulation says: "caller MUST know in advance what call would given the number (s)he dialed".
If regulation also states that waiting time shall not charged or shall not charged more than a local/national/whatever call, then an alternative is to separate telecommunication costs from service costs the former being billed by caller's telco based on whole duration, the later being billed byservice provider based on effective duration (whole duration minus waiting time). Of course, this requires that service providers are able to directly bill callers which, certainly, can't be easy or even possible in all situations. Some service providers require callers to enter a personal PIN code, before joining a queue. That could help to bind a caller to a paying customer and let the later one being charged for the services used by the caller.
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