Can you please let us know one thing about off-net traffic to AIS Thailand. As you probably know they have sender name whitelisting so when we sent traffic with some sender name like for example Facebook or Viber messages are not delivered to numbers who opted out unless sender name is whitelisted. In that case it will be delivered to all AIS numbers.
Do you know if messages sent from True move to AIS numbers will be delivered to such numbers? Also note that we have a lot of whitelisted senders at AIS but looks like messages are not delivered to all number and this whitelisting on AIS side might be the reason.