Have a potential customer that put in a hosted system 6 months ago and isn't real happy with it (goes down every week or two for an hour or a morning). I quoted a Summit system to them at the time and it was significantly less expensive than the hosted system (in part because we didn't have to run CAT5e/CAT6 cable which the hosted system required for the VoIP phones), but they went with the hosted system because it would give the caller an indication of how long they were on hold, and because the other vendor told them that analog lines were going away and hosted was the new thing. Anyway, they have Yealink phones with the hosted system and I was wondering if anyone had any experience with adding Yealink phones to a Summit or eMG80 and if it would work? Just trying to save the customer some money so they don't have to ditch their phone sets (about 35 sets).