Platform: Grandstream UCM
How to solve hasn’t used extension incoming call to forward external numbers (cellular user’s number)
My solution is one SIP number which is working on UCM 6208, Behind on UCM working 3 extensions those extensions will be incoming calling answered, but not used extension numbers only used own cellular mobile numbers. Those cellular numbers will be answered incoming calls.
Extension - Call Transfer - Call Forward Unconditional is only working the extension online which means connecting to server. If an extension offline disconnects from the server then incoming calls don’t transferred to external numbers, then UCM answered “No available agent”
What kind of configuration to fix my solution?