And, just to add some info (if they are any useful), the restaurants in Westin, IC, etc, when they use BoCommunication terminals, the terminals contain merchant name information that is the same to the hotel's 发票 (if they appear on your statement, it will be in the language of 拼音, not English). I guess this means those BoCommunication terminals are more China-oriented? Those transactions will not be recognized by Chase 5X bonus. Chase once told me clearly that transactions at the Italian restaurant in Ritz Carlton Financial Street, with the merchant name of "Li Si Ka Er Dun Jin Rong Jie" or something like that, will not earn 5X.
On the other hand, those BoC terminals at the front desks, they all have proper English names, like "St Regis Beijing" for my transaction today. Those transactions can be recognized for 5X bonus.
I'm guessing hotels above the level of Sheraton, have separate terminals for oversea visas and UnionPay cards. I say this because I only see BoComm terminals in Holiday Inns in Beijing, and I've been to all of them.
I clearly remember in Shijiazhuang, the front desk used the BoComm terminal, without incurring DCC. But I had to contact Chase to get the 5X. Maybe the hotel was so new, or maybe BoComm terminals were not registered for official IHG rewards. However, there did have Holiday Inn transactions through BoComm terminals, in Beijing, that were recognized by Chase for 5X points.
Those BoComm terminals are that type of mobile POS machines. BoC terminals at front desks are immobile, and have a separate keypad with mag and EMV readers.
These terminals have beatable DCC (at least, in Beijing, at the 15 hotels I've been to).