In a recent configuration for a migration I've been working on - I had to configure some trunk translation rules. For those that are not aware of what "trunk translation rules" are, these rule-sets that take effect outside of any dial plan translations and do not appear when the user dials a number from a Lync client.
When setting up analog extensions (new-csanalogdevice), you can set the number with -LineURI, and this function also allows you to set the extension, just as you would a normal Lync user's DID for enterprise voice (tel:+15553334444;ext=1234). Keep in mind, when creating a trunk translation rule, you will need to accommodate the rule to look for the ext=xxxx section of the number!
Or, completely omit the ext=1234 section from your analog extension standardization like I have done in my environment.
