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<p>Hello,</p>
<p>Keep-Alive works like a charm. Don't open any ports, because they
won't give you any official IP addresses - only domain names. What
I know so far: DTAG don't support T38 and transport was always
UDP.</p>
<p>You may find out additional information about the trunk when
querying DNS for SRV and NAPTR records.</p>
Sincerely,<br>
Paul<br>
<br>
<div class="moz-cite-prefix">Am 27.01.2018 um 18:55 schrieb Paul
Muaddib:<br>
</div>
<blockquote type="cite"
cite="mid:CAEjNe_HQP+O8sNvStR7MG4JLmupndY=GESLRBe5qwL0vmGWgKA@mail.gmail.com">
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<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>
<br>
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