Problem with Call ID, it says "Private" when dialing between extensions

Hello, I’m using Elastix 4.0.0, and when I’m calling from one extension to other, the phone shows “Private” instead of the Caller name or ID. I’m using Grandstream SIP phones and Cisco 79XX Series.

Extensions where configured as in our previous Elastix 2.5 server, is there any change regarding the caller id?

I can call everywhere, my only issue is regarding the Call ID between extensions.

Thank you!

Make sure you have this settings enabled on your sip.conf file

trustrpid = yes
sendrpid = yes

also verify the dialplan function CALLERID()

Hey! Still the same, no luck. I’ve checked the sip.conf and trust/send are enabled. Any other idea?