Hi RonR, thanks for your quick reply.
Actually, I tried this setting myself. If I called in from my cell, I get to aa without any issue. If I called in with different phone, it ring the phone attached to the device instead of forward the call to my cell. Also, The setting
Voice Services -> SP1 Service -> X_InboundCallRoute : {12341234567:aa},{sp1(12341234567)}
will changed back to
Voice Services -> SP1 Service -> X_InboundCallRoute : {12341234567:aa},{ph}
sometime.
Anything else you can think of that I can give it a try? Thanks.