You can force Lync to call a number via PSTN, even if this number belongs to a Lync user. You need to add a keyword ms-skip-rnl in the LineURI of a user. This can be used for testing of PSTN as example.
tel:+41xxxxxx;ms-skip-rnl
See Sonus example of application here: https://support.sonus.net/display/UXDOC30/Using+SBC+to+Process+Lync+to+Lync+Calls+(Replicating+an+upstream+forked+call+flow+in+a+downstream+installation)
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