Ascend-Xmit-Rate = the dial-in user's downloading speed at the time
the connection was established.
Ascend-Data-Rate = the dial-in user's UPloading speed at the time
the connection was established.
Only Maxes that have software version 5.0Ai13 (possibly earlier) or 5.0Ai28
support the "Ascend-Xmit-Rate" output in the STOP record. All versions
already output "Ascend-Data-Rate".
Maxes with patches (e.g. 5.0Ap33) don't support Ascend-Xmit-Rate,
Ascend-Modem-Slot-No, and Ascend-Modem-Port-No.
Remember that with V.34 and 56k, speeds may fluctuate throughout the call
depending on line conditions. If you want to see all the detailed info,
you'll have to watch the person disconnect and catch the modem info a
second or two later (none of which is logged).