I think your issue could just be the frequency of the tone. There is voice activated circuitry in your page adapter that might be prohibiting the tone.
The GOOD news is that the page adapter supports its own pre-page tone. You can use the contact closure (v/br pair) to make it work.
Here is where to connect it (from Valcom Install guide):
Pre-Page Alert Tone Option
The Pre-Page Alert Tone may be used when
accessing the unit from an electronic key
system, C. O. Line position, PABX Trunk Port or
a Page Port with a contact closure. Page Ports
must provide a contact closure output. To
enable the pre-page alert tone feature, place a
jumper on the yellow and black leads (outer pair
of RJ-11) of J3. (See Figure 1).
NOTE: The pre-page alert tone operates on
the primary paging input only.
Good Luck!
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