<div dir="ltr">Hi Paul,<div><br></div><div>got it running in several sites without major problems. As you said transport is either TCP or TLS. Faxing is basically passthrough only as the do not offer gateway services and I did not find a subscriber terminating T.38. If you use their provided equipment (Digibox) you so not need to setup anything special as the port mapping will be handled by the box itself (SIP and RTP gateway included). </div><div><br></div><div>BR</div><div><br></div><div>Kai</div></div><div class="gmail_extra"><br><div class="gmail_quote">2018-01-27 18:55 GMT+01:00 Paul Muaddib <span dir="ltr"><<a href="mailto:paul.muaddib83@gmail.com" target="_blank">paul.muaddib83@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Hi,<br><br>does anyone here have experience with the SIP trunk
service from the German Telekom: "DeutschlandLAN SIP-Trunk"? There is
little information from Deutsche Telekom on the Internet besides the
"Technical Technical Specification of the SIP - 1TR114" As I have read
so far, Deutsche Telekom has not necessarily been sticking to the
standard. <br><br>What I know so far<br><br>Transport protocol is probably TCP instead of UDP<br>Codecs: G. 711a and G. 722<br>Fax either via G. 711a or T. 38<br><br>My Setup<br>Internet <-----> Router/Firewall(NAT) <----> Freeswitch<br><br>According
to the instructions, they require you to open several ports in the
firewall. Is that really necessary? Does the Keep-Alive function work
without opening any port?<br><br>At the Federal Office for Information Security (BSI) it is additionally recommended to use a SIP proxy such as kamailio<br><br>At
the moment we are still using an ISDN gateway. I don't like to run into
problems when we switch over, because I can't go back then.<br><br></div>Best regards,<br></div>Paul</div>
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