Vodafone is pulling out all the stops to sweet talk regulators into approving its $22 billion acquisition of Liberty Global’s German and Central European cable assets, the latest being a proposal to grant Telefónica Deutschland full access to the Unitymedia cable network. With a combined reach of 23.7 million homes across a merged Vodafone-Unitymedia footprint, the offer might just slide. Crucial to Vodafone’s Cable Wholesale Agreement is the promise that Telefónica Deutschland can deliver competitive OTT video and broadband services, by offering DSL lines with download speeds of up to 300 Mbps. But we know Telefónica has a poor presence in OTT video in Germany, while Vodafone is putting a bigger emphasis on the TV business to rival Deutsche Telekom…