Tony, thank you for your answer. I understand the problem of NAT. The NAT is symmetric, so I thought I could translate ports to internal IP addresses. (That's what I have done with 3CX PBX and it worked). I can see the public IP address of the remote phone in my registration in Sipx PBX: <sip:2...@81.193.210.15:5062 ;line=3tg84a2k;x-sipX-privcontact=192.168.1.244%3A5062> So here are the public and private ip addresses of the external phone. The routers are configured that they translate specific ports to internal ip address. The router knows the internal address and port from who he has received the packet and he sends it back to the same ip address, at least it should send it. Correct me if I'm wrong, but I think that the phone wouldn't even register if this, what I try to accomplish, can't be done.
The Mikrotik can route the packets based on the RTP port, as long as all phones use distinct ports for RTP. Another problem in my theory would be the fact that the phone in my office tries to send the media through the SipX and not to communicate direct to the other phone. (I think that the phone should support Re-Invite, or am I wrong?) Shouldn't the sipX at least support By-pass mode? I have already done the same thing with the 3CX PBX. In that case I also had the 3CX PBX and one phone on the same subnet. Than, I had 2 more phones on the external office. I managed it to work with no VPN, just through double NAT with Mikrotik routers. Unless you have a a new trick up your sleeve that the world does not know > about, I don't see how ANY sip server behind nat will handle media for a > remote worker. > > I don't even want that the sip server handles the media, I just want that the server handles SIP, the media should go direct from one phone to another. > Your DNS (dyndns or not) needs to have all the records there, SRV and FQDN > (A record). The A record on public DNS "has to point to the public IP of > your Internet router". This is a HAVE-TO and not really optional or up for > discussion in SIP. > > > Thanks, that's what's confused me because of the remote phone. Probably a stupid question, but I couldn't fine any information about this, what exactly are the SRV records for? Are they used for SIP Register or also for RTP? Regards, -- Irena Dolovčak
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