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Protel 7000 Payphone... How to adjust speaker volume?

Everyone I call on my Protel 7000 payphone tells me that they can barely hear me. I thought that replacing the receiver would fix the problem, but it has not. Is there an adjustment anywhere that would resolve this? I am using MagicJack with a long phone cord. Could that be the issue? Thanks.

[EDIT] I guess the title of the thread is misleading; I know how to adjust the earpiece volume. I need to know how to adjust the "outgoing" volume. I don't know the correct term for this.
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