Two Analog Lines with Modems

[mutant]

What is the maximum connection that two analog lines (going through at least one central office) with V.9x (V.90 or V.92) modems will connect at? Is the limit somewhere around 33.6, a little higher or a little lower? Presume that the V.9x modems can connect at 50k when connecting to a digital line supporting V.9x from its originating analog line.

Thanks. And, hopefully I phrased the question correctly.