[Freeswitch-users] DeutschlandLAN SIP Trunk

[Paul Zillmann]

Hello,

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.

You may find out additional information about the trunk when querying 
DNS for SRV and NAPTR records.

Sincerely,
Paul

Am 27.01.2018 um 18:55 schrieb Paul Muaddib:
> Hi,
>
> 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.
>
> What I know so far
>
> Transport protocol is probably TCP instead of UDP
> Codecs: G. 711a and G. 722
> Fax either via G. 711a or T. 38
>
> My Setup
> Internet <-----> Router/Firewall(NAT) <----> Freeswitch
>
> 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?
>
> At the Federal Office for Information Security (BSI) it is 
> additionally recommended to use a SIP proxy such as kamailio
>
> 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.
>
> Best regards,
> Paul
>
>
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