RTP streams traverse FortiVoice unit

Forum|Forum|4 years ago
April 4, 2022
6 replies
4565 views

Hello,

I took a packet capture for SIP and RTP traffic when placing a call between two FortiFone which are asiggned local IP extension on the same FortiVoice unit.

The two phones and the FortiVoice are in the same subnet.

My observation is that the RTP goes from the first phone to the Fortivoice then from Fortivoice to the second phone and vice versa.

Is this normal? can I alter this behaviour?

FortiVoice

Anthony_E

Staff

Hello Akmostafa,

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible.

Thanks,

Best Regards

AkmostafaAuthor

Explorer

attached for reference sip ok from FV to phone 1.PNG sip ok from phone 2.PNG invite from FV to phone 2.PNG invite from phone 1 to FV.PNG sip invite 2.PNG screenshots for packet capture

1st phone ip 172.16.14.228

2nd phone 172.16.14.215

FortiVoice 172.16.14.45

in the 1st SIP invite : from phone 1: in SDP the ip of the phone (172.16.14.228) is in the connection line

another invite sent from Fortivoice to phone 2 and Fortivoice ip in the connection line of SDP

OK message from phne 2 to fortivoice with phone 2 ip (172.16.14.215) in the connection line of SDP

ok message from FortiVoice to the first phone: FortiVoice IP (172.16.14.45) appears in the connection line in the SDP

the third screenshot showing the RTP going from the first phone to the FortiVoice and vise versa.

RTP packets (172.16.14.45 <> 172.16.14.228) and ( 172.16.14.45 <> 172.16.14.215)

pchee

Staff

Hi Akmostafa,

This behavior is normal as we do not have "Media Bypass" feature in FortiVoice.

AkmostafaAuthor

Explorer

So if FortiVoice is installed in the DC in HQ and two phones want to talk to each other : the media flow will traverse the WAN to FortiVoice from branch to HQ then from HQ back to the branch?