OpenText Legal interview questions

They arranged telephone interview with HR. Sent 20 mins telling me what a great company it is, and how I would be a great fit. Then ambushed me by saying they would not take things any further unless I agreed my salary there and then. Would not tell me what they were offering, would not give me an hour to research and come back to them with a figure (despite saying there was a great bonus scheme and many other benefits etc, which obviously one would need to consider - no legal dept salary info on Glassdoor). Refused to tell me why they were doing this, and if they thought refusing to negotiate with someone who is applying for a job where negotiation is part of the jobspec is sensible. Absolutely absurd behavioiur