When using Grandstream 1450 configured with FreePBX Endpoint manager, outbound callerID (number) goes out as unknown.
Aastra phones and softphones report callerid properly.
I have a customer with these phones, and his cold calls are being rejected because of this. He is losing business.
I have spent 2 days working towards a solution. The only solution I can suggest at this time is drastic. Replace the phones!
Anyone else have any suggestions?