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@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
_________________________________________________________________________ Professional FreeSWITCH Consulting Services: consulting@freeswitch.org http://www.freeswitchsolutions.com
Official FreeSWITCH Sites http://www.freeswitch.org http://confluence.freeswitch.org http://www.cluecon.com
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org