VOIP issues fortiwifi f50e
Installed FortiWiFi 50E , firmware 6.2.7 build 1190
Issue: VOIP phones are working except for park function. When receptionist parks a call, the next user cannot hear the call if the pick up the parks call. Weird thing is that if the pick up the parked call, place it on hold and then resume the call, the call will then proceed as normal. So: can't pickup parked calls unless you press hold twice.
What we've tried:
1. disable sip ALG helpers through CLI
2. Created a few services to allow traffic on ports: 53 UDP 5060-5062 UDP 20000-40000 UDP and allowed these services to talk from LAN to WAN and from WAN to LAN
3. rebooted phones, switches, firewall etc.
4. Created a ticket with Fortinet, currently they are researching the issue...but my client is a Karen and is breathing down my back.
Thank you for any help!