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.

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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