full duplex cordless speakerphones?

My parents are having a hell of a time trying to read bedtime stories over the speakerphone to my kids because of the whole half duplex thing. I'm wondering if anyone knows of or can recommend a cordless phone with a full duplex speakerphone handset. I'm familiar with the echo cancellation that makes this difficult, but hopefully there's something out there. I've read about Panasonic's "digital duplex" phones, but I haven't found any reviews on how they perform, and none of their marketing materials really mention whether or not various models have this feature... and if it is mentioned, it doesn't mention if its a base speakerphone feature or a handset speakerphone feature.

Thanks for any recommendations.

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