Hi Paul, 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). BR Kai 2018-01-27 18:55 GMT+01:00 Paul Muaddib <paul.muaddib83@gmail.com>:
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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