[Serusers] RTP Proxy help

[Stephen Miles]

Hello all,

I am having a bit of a problem with getting RTP Proxy to work the way I 
need it to with PSTN gateway calling.

When I call from the PSTN gateway to the softphone it uses the rtp ptoxy 
both ways, from ser to the gateway and from ser to the softphone. When I 
call from the softphone to the PSTN how ever it only proxys from the 
gateway to ser and not from ser to the softphone.

I have tried all sorts of things to force_rtp_proxy for both ends of the 
call but so far it's a no go.

Any help would be great.

One thing I did notice is that when I call from the PSTN to the 
softphone it matches a transaction and the rtp proxy works for both 
ends, but when calling from the softphone to the PSTN is says failed to 
match transaction and the rtp proxy only works for one end of the call.


Thanks in advance,

Stephen

# main routing logic

route{
         # initial sanity checks -- messages with
         # max_forwards==0, or excessively long requests
         if (!mf_process_maxfwd_header("10")) {
                 sl_send_reply("483","Too Many Hops");
                 break;
         };
         if (msg:len >=  max_len ) {
                 sl_send_reply("513", "Message too big");
                 break;
         };

         # !! Nathelper
         # Special handling for NATed clients; first, NAT test is
         # executed: it looks for via!=received and RFC1918 addresses
         # in Contact (may fail if line-folding is used); also,
         # the received test should, if completed, should check all
         # vias for rpesence of received
         #if (nat_uac_test("3")) {
                 # Allow RR-ed requests, as these may indicate that
                 # a NAT-enabled proxy takes care of it; unless it is
                 # a REGISTER

                 if (method == "REGISTER" || ! search("^Record-Route:")) {
                     log("LOG: Someone trying to register from private 
IP, rewriting\n");

                     # This will work only for user agents that support 
symmetric
                     # communication. We tested quite many of them and 
majority is
                     # smart enough to be symmetric. In some phones it 
takes a configuration
                     # option. With Cisco 7960, it is called 
NAT_Enable=Yes, with kphone it is
                     # called "symmetric media" and "symmetric signalling".

                     fix_nated_contact(); # Rewrite contact with source 
IP of signalling
                     force_rport(); # Add rport parameter to topmost Via
                     setflag(6);    # Mark as NATed
                 };
         #};

         if (method == "INVITE") {
            fix_nated_sdp("1"); # Add direction=active to SDP
            log("Arse: forcing rtpproxy in invite");
            force_rtp_proxy();
            log("Arse: fix_nated_sdp being run");
         };
         # we record-route all messages -- to make sure that
         # subsequent messages will go through our proxy; that's
         # particularly good if upstream and downstream entities
         # use different transport protocol
         #if (!method=="REGISTER") record_route();

         # subsequent messages withing a dialog should take the
         # path determined by record-routing
         if (loose_route()) {
                 # mark routing logic in request
                 append_hf("P-hint: rr-enforced\r\n");
                 route(1);
                 break;
         };

         if (!uri==myself) {
                 # mark routing logic in request
                 append_hf("P-hint: outbound\r\n");
                 route(1);
                 break;
         };

         # if the request is for other domain use UsrLoc
         # (in case, it does not work, use the following command
         # with proper names and addresses in it)
         if (uri=~"202.180.83.12") {
           rewritehostport("sipsrv2.tranzpeer.net:5060");
         };
         if (uri=~"sipsrv2.tranzpeer.net") {

                 if (method=="REGISTER") {

# Uncomment this if you want to use digest authentication
                         if (!www_authorize("sipsrv2.tranzpeer.net", 
"subscriber")) {
                                 www_challenge("sipsrv2.tranzpeer.net", 
"0");
                                 break;
                         };

                         save("location");
                         break;
                 };

                 lookup("aliases");
                 if (!uri==myself) {
                         append_hf("P-hint: outbound alias\r\n");
                         route(1);
                         break;
                 };

                 # native SIP destinations are handled using our USRLOC DB
                 if (!lookup("location")) {
                         forward(202.180.125.200,5060);
#                       sl_send_reply("404", "Not Found");
                         break;
                 };
         };
         append_hf("P-hint: usrloc applied\r\n");
         route(1);
}

route[1]
{
         # !! Nathelper
         if (uri=~"[@:](192\.168\.|10\.|172\.(1[6-9]|2[0-9]|3[0-1])\.)" 
&& !search("^Route:")){
             sl_send_reply("479", "We don't forward to private IP 
addresses");
             break;
         };

         # if client or server know to be behind a NAT, enable relay
         if (isflagset(6)) {
             log("Arse: force_rtp_proxy\n");
             force_rtp_proxy();
         };

         # NAT processing of replies; apply to all transactions (for 
example,
         # re-INVITEs from public to private UA are hard to identify as
         # NATed at the moment of request processing); look at replies
         t_on_reply("1");

         # send it out now; use stateful forwarding as it works reliably
         # even for UDP2TCP
         if (!t_relay()) {
                 sl_reply_error();
         };
}

# !! Nathelper
onreply_route[1] {
     # NATed transaction ?
     if (isflagset(6) && status =~ "(183)|2[0-9][0-9]") {
         fix_nated_contact();
         force_rtp_proxy();
     # otherwise, is it a transaction behind a NAT and we did not
     # know at time of request processing ? (RFC1918 contacts)
     } else if (nat_uac_test("1")) {
         fix_nated_contact();
     };
}


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