8 May
2018
8 May
'18
9:29 a.m.
Hello Henning, hello Community
we are using high quality Codecs with bitrates up to 1500Kbit (PCM), but usually 128kbit
(Mpeg1 Layer3 or AAC-LD). 128 is Not too much, but I want to be on the save side and
therefore I prefer solution without Proxy.
By the way I am audio engineer at a german commercial radio broadcast network and we try
to establish our own "ISDN replacement-SIP Network" for reporting from events
like Soccer Games, Karneval, Rock Concerts, Political Party Summits, Lawsuits...
whatever. I want to keep frontend as simple as it gets for the reporter.
Anyway, people told me that the SIP Server of "Mayah Communications" is working
without the need of stun or other Client side gadgets, but I am also told that this Mayah
server works without Proxy functions. That Company won't tell me their settings of
course, but if possible I'd like to have this feature for our SIP Server. At the
moment I have still vast problems with connectivity from Devices that are logged on via
Vodafone Mobile Network. Even Stun does not work. I guess that CGNAT of Vodafone (All of
the Devices I have tested within Vodafone allocate IP Addresses in private range!) opens
different Ports for different outbound connections which is the case if I use a 3rd party
Stun Server. I have read a lot about this issue these days and there is solution, but I am
not too deep into scripting an how to edit the kamailio.cfg. For example, I tried to start
Kamailio with Stun, but if I tried to use the built in Stun, I've got error messages
on the Client and also in the logfile of the SIP Server (incomplete header of Stun
message) Anyone can help, please?
Best regards Gerd
Von: Henning Westerholt <hw(a)kamailio.org>
Gesendet: Montag, 7. Mai 2018 20:56
An: sr-users(a)lists.kamailio.org
Cc: Pinter, Gerd. <G.Pinter(a)radionrw.de>
Betreff: Re: [SR-Users] Connecting UAs behind Firewall/CgNat with Kamailio without using a
Stun Server
Am Montag, 7. Mai 2018, 13:11:50 CEST schrieb Pinter, Gerd.:
Hi
Won't RTP Proxy cause al lot of traffic? We only have 155mbit for all IT
traffic, and our Sip Server also have to manage connections outbound our
house, where I thought it might be better let those clients do the payload
by peer to peer connection. If I got it right this traffic would flow thru
our Sip server with RTP Proxy enabled.
Thanks a lot
Hello Gerd,
you understood it correctly, indeed using rtpengine/rtpproxy would mean routing
additionally your RTP traffic to your network. Depending on the number of sessions and the
used codec it may work perfectly, only with some QoS tuning or not at all. You can
estimate the bandwith, there are also some calculators online.
Best regards,
Henning Westerholt