Welltech ePBX80 V.1.1 - Manual (Page 114)

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 In Branch, set up routing table as follows. Prefix is 04; Digits Length is 0; Drop is 2, so
the user in Branch can call PSTN number 042xxxxxxx which is located in HQ . The
ePBX80 will drop 02 first and then send 2xxxxxxx to Branch.
 In HQ, set routing table as below. Prefix is 2; Digits Length is 0, so the user in Branch
can call PSTN number 042xxxxxxx which is located in Branch . The ePBX80 will receive
and allow 2xxxxxxx to send out in HQ FXO Port.
Note: in the outgoing routing only allow one office dial out . So you also need to create another
prefix number and let extensions of office 2 can be dial out to Branch office, if you had created