[Freeswitch-users] DeutschlandLAN SIP Trunk

[Giovanni Maruzzelli]

You seems to be much interested in security.

It is a complete different world from isdn to a sip trunk.

There are not ready made secure way to implement sip, particularly and
especially a sip proxy.

You can deeply study FreeSWITCH docs and books, and come out with something
good, with some effort.

To achieve the same with a proxy is much more difficult.

In both case (FreeSWITCH alone, or frontended by a proxy) is probably much
more cost effective to ask a consultant to take care of it.

Sent via mobile, please forgive typos and brevity.

cell: +39 347 266 56 18
Giovanni Maruzzelli
OpenTelecom.IT

On Jan 28, 2018 3:10 PM, "Paul Muaddib" <paul.muaddib83 at gmail.com> wrote:

> 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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