Welltech ePBX80 V.1.1 - Manual (Page 111)

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Step4: Set up outgoing routing
 In HQ, set up routing table as follows. So the user in HQ can call extension 401 which is
located in Branch
.
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 dial out to Branch office if you had created office
2. The Example is as follows.
If extensions of office 2 want to dial to ext:401, user has to dial 55401.