Hi,
One of our FreePBX Sever is having a weird issue.
We can receive / make calls, no problems there. But whenever an already answered inbound call is transferred to another extension on the same pbx the call drops after 25-30 secs. This does not happen when the original party which have answered the call is in a 3-way conference call with another extension.
I have tried changing the RTP timers (rtptimeout 300, rtpkeepalive 30) , checked all my NAT settings, SIP & RTP ports.
FreePBX 12.0.76.2
Asterisk (Ver. 11.16.0)
Grandstream IP Phones (have reset them also).
All phones are on the same network.
All Inbound calls destinations are ring groups (hunt).
Can anyone suggest where should we look further.
Thanks.