Chapter 12 VoIP Trunking
A company has its headquarters in one city and a branch office in another. The sales manager (A) from headquarters often needs to call salespeople (D) employed at the branch office. The sales manager often works away from the headquarters office and the sales employees often work away from the branch office. The sales manager and the sales employees have PSTN phones (mobile or land based). The two offices have VoIP trunking devices. The sales manager wants to use VoIP trunking to save on calls to his sales team. The head office has a ZyXEL Device (B) with a PSTN line (tel:
Figure 130 PSTN to PSTN Example
The proposed solution is to configure a call rule which will allow the sales manager to call into the headquarters via PSTN, establish a VoIP link between the two ZyXEL Devices and have the remote peer device forward calls to the sales employees via PSTN.
12.9.2 Configuration Details: OutgoingThe ZyXEL Device (at headquarters) from which the VoIP link originates needs to have the following configuration settings:
1Auto attendant authentication needs to be enabled for PSTN calls coming into the headquarters’ ZyXEL Device. This ensures that no unauthorized callers use VoIP trunking. In this example the PIN (Personal Identification Number) is set to “12345”. The settings dealing with dialing interval and a timeout period are left at default. The ZyXEL Device waits 10 seconds (after initial connection between PSTN caller and the ZyXEL Device) for the PSTN caller to initiate VoIP trunking by dialing another number. It waits 3 seconds between dialing digits before it determines that the entire phone number is entered. These settings can be configured in the VoIP > Trunking > General screen.
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