Hi Mikhail,

That’s correct!

Bono nodes run an instance of restund (http://www.creytiv.com/restund.html) 
which acts as a STUN/TURN server to help establish media flows if the endpoints 
support ICE 
(https://en.wikipedia.org/wiki/Interactive_Connectivity_Establishment).  In the 
event that the endpoints are behind restrictive NATs, the restund service may 
need to proxy the media streams to allow them to get through the NATs (using 
TURN).

If your endpoints are behind NATs but do not support ICE for media NAT 
traversal, you will need the P-CSCF to anchor the media on all calls.  Bono 
does not support this functionality, but our commercial P-CSCF, Perimeta 
(http://www.metaswitch.com/products/perimeta-session-border-controller), does.

Ellie

From: Clearwater [mailto:[email protected]] On 
Behalf Of Mikhail Kulinich
Sent: 27 October 2015 09:35
To: [email protected]
Subject: [Clearwater] RTP forwarding

Hello!

I found out that Bono requires some ports to be opened to external network.
Here is the extraction from the firewall documentation page 
(http://clearwater.readthedocs.org/en/stable/Clearwater_IP_Port_Usage/index.html):

·         RTP forwarding:

·         UDP/32768-65535

As far as I understand, those ports may be used to carry RTP traffic between 2 
IMS clients if they are, for instance, on different sub-nets (e.g. can't 
communicate directly with each other). Bono acts as RTP proxy. Am I right? If 
not, could you please clarify what is RTP forwarding?

--
Thank you,
Mikhail
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