On 2/23/19 5:39 PM, Joshua C. Colp wrote:
On Sat, Feb 23, 2019, at 12:17 PM, hw wrote:
<snip>
Any source to UDP ports X to Y (10000 to 20000 by default) allow.
Are you saying that the ports specified in rtp.conf ('rtpstart' and
'rtpend') specify with ports asterisk uses regardless whether RTP or
SRTP is being used? Is that why you speak of "media" (ports)?
(That would have been and would answer my original question: Where to
specify the SRTP ports?)
Yes.
Cool :)
Maybe a hint like "these ports are used for SRTP as well" in the default
rtp.conf would clarify this. (I was actually looking for an srtp.conf
to begin with ...)
What you can't do is limit the rule based on the source of media, except for
circumstances where you know for sure the source.
Note that RTP ports in Asterisk aren't open all the time and only listen when a
call is using it, and they also learn the source of media - blocking out other
sources.
ok
After opening the ports specified in rtp.conf, both RTP and SRTP were
working in the test calls I made. But:
How do clients know which media ports to use? Is asterisk telling them
that?
I. e., can I (basically) rely on the clients to use the media ports in
rtp.conf, or did I just get lucky that by chance the clients happened to
use these ports when I made the test calls?
It's exchanged as part of call setup using SDP. SDP specifies where media
should be sent, the codecs that can be used, and also controls hold/unhold.
Each side provides SDP which is parsed, interpreted, negotiated, and used.
Thank you very much! So I got this to work; next step would be to try
it with clients from outside the local network ... :)
--
_____________________________________________________________________
-- Bandwidth and Colocation Provided by http://www.api-digital.com --
Check out the new Asterisk community forum at: https://community.asterisk.org/
New to Asterisk? Start here:
https://wiki.asterisk.org/wiki/display/AST/Getting+Started
asterisk-users mailing list
To UNSUBSCRIBE or update options visit:
http://lists.digium.com/mailman/listinfo/asterisk-users
