I agree with what Pix said.
” What I may conclude that the second area testing team may had not setup long sms but only short (empty sms, not enough to expire T3113)”
To me it does not seem a T3113 issue.
This timer is on BSC and the 3GPP spec 44.018 says:
T3113: This timer is started when the network has sent a PAGING REQUEST message and is stopped
when the network has received the PAGING RESPONSE message.
So this is independent of SMS message size.
But it’s an interesting issue.
If you have other feedback, please share it.