Welltech ePBX80 V.1.1 - Manual (Page 126)

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Figure 2
Step 3: register to Epbx80 by IP Phone or FXS gateway or other SIP software.
Epbx80 prepare 10 extension numbers by default.
User can to use it or to create new extensions. (see figure 3)
Figure 3
Step 4: to configure outgoing routing.
Specify more prefixes number to go out via local FXO port. Such as local
Telecom number.
In this we are area code is 02, local Telecom number is 8xxxxxxx, total
digits length is 10 (include area code 02).
Configure all options.