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FAQ
- What is the reason that IP-PBX is not registered in ITSP server?
- You can find the reason on‘Registration Status’ under ‘System Information’ menu. ‘Registration Status’ may show one of the following messages.
  ▷ Registered : Registration OK
  ▷ Unregistered (No Use) : Registering number isn’t set.
  ▷ Unregistered (Not Ready Yet) : The system is just booted and the applications are initializing now.
  ▷ Unregistered (No Network Connection)
  ▷ Unregistered (Timeout) : No response from the outbound server
  ▷ Unregistered (XXX) : When registration is failed, error number from the outbound server is displayed.
  ▶ 401: authorization is failed
  ▶ 403 or 404: disallowed or no-existing number
- How many can be set up for Auto Attendant feature?
- Each number (VoIP, PSTN) can have different set up
- Is there any way that prevents ‘Absent’ message when incoming calls are not answered?
- If you prolong ‘No Answer Timeout’ under ‘Supplement Services’ menu, ITSP server will disconnect calls before the message.
- How can I forward the calls coming from the main number?
- Input extension number on ‘Inbound Destined Extension 1’ and set up ‘Call Forwarding’ on that number.
- How can I set up call forward for the calls from‘Group Number’?
- Change ‘Forwarding Setting using IVR’ to‘Allowed’ under ‘Group Modification’ menu, then dial *94 on the IP phone and follow voice instruction for ’Call Forwarding’.
- If I select ‘Ring All Phones’ for ‘Hunting Method’ in ‘Group Number’, how many IP phones ring simultaneously at most?
- Up to 10 IP phones ring together.
- Can IP phones pick up calls coming from PSTN Trunk? And can legacy phone pick up calls coming from VoIP Trunk?
- Yes, for both ways are possible.
- How do I check if ‘Call Pickup’ is working well?
- Check ‘Call Pickup’ feature under Configuration menu on IP phone and see if it is same as ‘Call Pickup Code’ under “Supplement Services’ menu.
- Is Conference Call feature available?
- The current version supports only 3-way conference call
- When making outbound calls, can I change the caller ID as I want?
- You can change it either in ‘Display Number’ under ‘VoIP Numbers’menu or ‘Displaying Number (CID) under‘Extension Modification’menu.
- I have set up ‘Area Code’ on ‘General Information’ menu, yet it’s not working.
- Check if there is any confusion with ‘Dialplans’.
- How can I use ‘Area Code’ feature on IP phone?
- Default code of IP phones will be prioritized. To prevent potential trouble, please do not set up the area code on IP phones.
- Can I send SMS on IP phone?
- SMS can be sent if the ITSP provides the service with the phones which are tested for interlock with Coretree’s product.
- It still shows 0 even though legacy analog phone is not connected to FXS port.?
- It is supposed to show 0 because it is impossible to monitor if the legacy analog phone is attached to FXS port since the handset is off-hook.
- Can I use other IP Phones (from other manufacturers?)
- There won’t be any problem with basic features such as making and receiving calls. Yet there could be some trouble on features like call transfer and call pickup and these problems won’t be serviced for technical support. For this reason, we recommend IP phones that IP-PBX manufacturers provide.
- ‘Inter-Office Call’is not working.
- Please make sure the followings;
  ▷ If ‘Installed Location’ on every IP-PBX is set differently.
  ▷ 'If your public IP address is set up on ‘Address Server’s IP address of IP-PBX which is used as address server.
  ▷ If public IP address is set up on ‘Address Server’s IP address of IP-PBX which is not used as address server.
  ▷ If other office public IP address and extension/group numbers are set up on ‘Branch List’ of address server.
  ▷ If PBX Domain is the same in every IP PBX.
- Is ‘Inter-Office Call’ possible between Coretree IP-PBX and other vendor’s IP-PBX?
- Technically it is possible, yet co-work with other IP-PBX vendor is needed.
- Is ‘Inter-Office Call” possible between Coretree IP-PBX and other vendor’s media gateway?
- It is possible with most media gateways that supports routing table

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