can i priority shape sip traffic like this?

[mercy_angel]

 I red documents  for VOIP priotizing https://docs.fortinet.com/document/fortigate/5.6.0/cookbook/190566/traffic-shaping-for-voip

but when i have a tunnel for a voip central server (its not in our hq), is destionation that IP sip server and outg interface that tunnel? As you can see i priotize sip traffic, not voip as a protocol.

Look the picture below.

[ElwinBERRAR]

Yes, it’s traffic shaping.

You’re giving SIP packets higher priority to the VoIP server through the VPN interface. Just note this only covers SIP signaling (UDP 5060). For better call quality, you should also shape RTP traffic since that’s where the actual voice goes. Add another shaping rule for the RTP ports your PBX uses, usually UDP 10000–20000.

More info:
Fortinet Documentation – Traffic shaping
Traffic shaping and policing explained

[shefakh1]

Depends how you shape, and also if your circuit is burstable or not. Your provider might let you exceed your CIR in some instances, which wouldn't be possible if you were capping it yourself, but you don't want to find yourself in a position where congestion and FIFO decides what traffic gets queued and what doesn't.