![]() Our office used Vonage back when they first started putting tv commercials on the air. and a customer/partner for over twelve years at this point. But I have been working with my provider since their "beta state" days. Or that both sides cannot initiate or even just push at each other unidirectionally. Just because the customer side is a client device does not mean that the audio stream cannot be initiated from the server side. It is very possible the client device initiates RTP but Ive been told it does not by one Freeswitch "expert". But all I know right now is what it takes to make it work here and for my customers. But considering on standard SOHO routers the only way to open the firewall on a client by client basis is to port forward I understand their get what your saying. My provider likes to tell their customers to port forward. We have been doing it the same since and never have issues. Once I built the firewall rules in the manner Ive explained, things started working fine whereas before the connections only worked for moments after the ATA's were rebooted(same server) and never at all when SIP and RTP were separate servers. Looking above at my picture- I came up with those addresses by watching for multiple phone calls in and out. So an unsolicited connection (from the RTP server) to the firewall that was actually solicited by the SIP server on the phone ata's/SIP client's behalf. In some cases such as my provider and other commercial grade carriers the RTP can come from the actual carrier direct. In allot of cases (and probably most in residential/small business focused systems) RTP comes from the same server that the client registers SIP on. The LAN address of the ATA/SIP client is in the header. If I do not use the proxy then the connection shows up as (one instance per phone). This is shown on my provider dashboard under "connected devices". The SIP server believes that my SIP phone is right up against the connection with no NAT. In my case Im behind SIPRoxd here so- which is my obfuscated public IP address. With that in mind remember that the SIP header provides all the information that the provider needs to connect back to you. That was a Windows 2000 machine which I put a software firewall on. I constantly had traffic pounding on my Windows machine from the outside. Anybody that knows what they are doing can reach a target behind a NAT router (without a firewall). I learned the hard way that NAT is not a security measure. I can't see how they could possibly do anything useful though. It is my opinion that those rules on WAN are both necessary and can never actually pass any traffic. The server already knows its way in via information it got from the SIP said in VoIP phones that will not register behind a PFsense firewall: We are not port forwarding but simply allowing the server access to the ATA. You need to make calls and watch your states and firewall logs and see how things are trying to connect. More than one device could be done by expanding the destination or by creating rules for each client device. In this case this is a single ATA feeding a couple of phones in a small office. It is hit and miss whether the calls connect to the carrier or SIP server for RTP. Provider SIP on top and the carrier they are using as the last two rules. But you can see that the carrier IP's have a separate rule but identical to the provider. In this picture there is no traffic as they just moved and we have yet to plug in the phones. I get weird private space IP's in my call logs sometimes.īuild an incoming firewall rule on your WAN that points to your client device(s) No port forward! Just a rule(s). We had a customer using Zoiper recently and when we looked at the SIP invites it was sending some random private IP to connect to with RTP. But I have never failed to get a VOIP system to said in VoIP phones that will not register behind a PFsense firewall:Ĭan the remote end hear you when you are able to make a call? then finally SIProxd until I get an unknown SIP provider working. SIProxd however gives a little priority apparently. But everywhere else just need the incoming WAN rules. Then they changed a few things and it became unnecessary. You have to play and experiment sometimes. Not originally designed to be behind NAT. VOIP was not originally designed for residential service. Companies now do things just different enough to avoid the same fate.Īlso. Keep in mind that companies are still trying to avoid what happened to Vonage back in the day. Some *** VoIP insists on using a fixed source port, Generally speaking you should not need to do anything special for internal phones connecting an external PBX. Said in VoIP phones that will not register behind a PFsense firewall:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |