I recently obtained an 880 touchtone speakerphone. The speakerphone part worked fine but it would not dial out nor ring. Thinking the jack was wired wrong, I switched the green and red wires. It worked but the speakerphone stopped working. I hooked it up according to the TCI schematic and it still doesn't work, the speakerphone, that is. Rings, dials out, fine with speakerphone, off, but goes dead when speakerphone switched on. Any ideas? Thanks

Bill