Just a guess, but I suspect that this might be related with strictrtp setting 
in rtp.conf, which learns the correct source in doing so drops a few packets.
I would try to disable strictrtp for testing purposes and if this works add 
some delay before playing back the media.



With best regards

Florian Floimair
Innovation - Software-Development

COMMEND INTERNATIONAL GMBH
A-5020 Salzburg, Saalachstraße 51
http://www.commend.com<http://www.commend.com/>

Security and Communication by Commend

FN 178618z | LG Salzburg

Von: asterisk-users <[email protected]> im Auftrag von 
Mark Farmer <[email protected]>
Antworten an: Asterisk Users Mailing List - Non-Commercial Discussion 
<[email protected]>
Datum: Freitag, 14. Juni 2019 um 15:15
An: Asterisk Users Mailing List - Non-Commercial Discussion 
<[email protected]>
Betreff: [asterisk-users] Early Media Issue

Hi all

I've got an issue where when I call a number that just plays early media back 
to me.
Instead of hearing the full sequence of tones I hear a short ringing then part 
of the sequence. What seems odd is that I can see the telephone-event/8000 
being passed up the chain but when it gets to Asterisk, it is never sent back 
to the phone. Instead I just see the usual RTP flows.

I've been trying to fix this for hours, does anyone have any ideas how to get 
this working correctly?

Asterisk version is 13.25.0

The settings I think are relevant (I'm using chan_sip):

(sip.conf)
ignoresdpversion=yes
internal_timing=yes
progressinband=never
silencesuppression=no
prematuremedia=no

(Per peer)
progressinband=yes
directrtpsetup=no
dtmfmode=rfc2833
directmedia=no
silencesuppression=no
prematuremedia=no


TIA
Mark.

--
Mark Farmer
[email protected]<mailto:[email protected]>
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