Hello,

Config is more or less like the standard one:

route[WITHINDLG] {

  if (!has_totag()) return;

if (loose_route()) {

    route(RURIALIAS);

    if ( is_method("ACK") ) {

      xlogl("L_INFO", "[$cfg(route)] ACK is forwarded statelessy\n");

      route(NATMANAGE);

    } else if (is_method("NOTIFY") ) {

# Add Record-Route for in-dialog NOTIFY as per RFC 6665.

route(RECORD_ROUTE);

}

    xlogl("L_INFO", "[$cfg(route)] In Dialog loose_route, Relaying\n");

route(RELAY);

      exit;

    };

    if (is_method("SUBSCRIBE") && uri == myself) {

      xlogl("L_INFO", "[$cfg(route)] in-dialog subscribe requests, Checking Dialog.\n");

      route(PRESENCE);

      exit;

    }

    if ( is_method("ACK") ) {

      if ( t_check_trans() ) {

        xlogl("L_INFO", "[$cfg(route)] ACK in transaction. Relaying\n");

        route(RELAY);

        exit;

        } else {

          xlogl("L_WARN", "[$cfg(route)] ACK without matching transaction ... ignore and discard\n");

          sl_send_reply("606", "Not Acceptable");

          exit;

        }

      }

      xlogl("L_WARN", "[$cfg(route)] Unknown Dialog\n");

      sl_send_reply("404","Not Found");

      exit;

}

route[RURIALIAS] {

    if(isdsturiset() || ($du != "")) {

        xlogl("L_INFO", "[$cfg(route)]: Destination URI is set, no un-aliasing is needed\n");

        return;

    }

    xlogl("L_INFO", "[$cfg(route)] --Start Route--\n");

    xlogl("L_INFO", "[$cfg(route)]: Route using R-URI, any alias on R-URI ('$ru')?\n");

    handle_ruri_alias();

    switch ($rc) {

    case -1:

        xlogl("L_WARN", "[$cfg(route)]: Failed to handle alias of R-URI $ru\n");

        send_reply("400","Bad Request");

        exit;

    case 1:

        xlogl("L_INFO", "[$cfg(route)]: Alias parsed, routing $rm from $fu to $du\n");

        break;

    case 2:

        xlogl("L_INFO", "[$cfg(route)]: Alias not found, routing $rm from $fu to $ru\n");

        break;

    };

    return;

}

route[NATMANAGE] {

if(has_body("application/sdp")) {

      route(RTPMANAGE);

    }

    # Set FLB_NATB? Only in within-dialog request with nat=yes on Route header initiated by AS

    if (is_request() && has_totag() && check_route_param("nat=yes") && isflagset(FLS_FROM_ASTERISK)) {

       setbflag(FLB_NATB);

    }

    # Return unless FLT_NATS or FLB_NATB are set

    if (!(isflagset(FLT_NATS) || isbflagset(FLB_NATB))) {

        xlogl("L_INFO", "[$cfg(route)] No endpoint is behind NAT, return\n");

        if(nat_uac_test("1")) {

          xlogl("L_INFO", "[$cfg(route)] Contact is behind NAT, Fixing\n");

          fix_nated_contact();

        }

        return;

    } else {

        xlogl("L_INFO", "[$cfg(route)] One or both endpoints are behind NAT, continue!\n");

    }

    # Add nat=yes in record-route? Only in initial requests when called from branch_route

    if (is_request() && !has_totag() && t_is_branch_route()) {

        xlogl("L_INFO", "[$cfg(route)] Add nat=yes to record-route (reason: initial request called from branch route)\n");

        add_rr_param(";nat=yes");

    }

  if (is_reply()) {

      if(isbflagset(FLB_NATB)) {

      fix_nated_contact();

      }

    }

}

route[RELAY] {

route(SETUP_BY_TRANSPORT);

if (is_method("INVITE|BYE|SUBSCRIBE|UPDATE")) {

if(!t_is_set("branch_route")) t_on_branch("MANAGE_BRANCH");

}

if (is_method("INVITE|SUBSCRIBE|UPDATE")) {

if(!t_is_set("onreply_route")) t_on_reply("MANAGE_REPLY");

}

if (is_method("INVITE")) {

if(!t_is_set("failure_route")) t_on_failure("MANAGE_FAILURE");

}

if (!t_relay()) {

sl_reply_error();

}

exit;

}

}

route[SETUP_BY_TRANSPORT] {

 if ($ru =~ "transport=ws") {

  xlogl("L_INFO","[$cfg(route)] Request going to WS");

if(sdp_with_transport("RTP/SAVPF")) {

          xlogl("L_INFO","[$cfg(route)] Request going from WS to WS");

          rtpengine_manage("force trust-address replace-origin replace-session-connection ICE=force");

          t_on_reply("REPLY_WS_TO_WS");

          return;

        }

  xlogl("L_INFO","[$cfg(route)] Request going to WS from AS");

rtpengine_manage("rtcp-mux-offer generate-mid DTLS=passive SDES-off ICE=force RTP/SAVPF");

  force_send_socket(tls:MY_EXTERNAL_IP_ADDR:10443);

t_on_reply("REPLY_FROM_WS");

}

else if ($proto =~ "ws") {

xlog("L_INFO", "Request coming from WS");

rtpengine_manage("rtcp-mux-demux DTLS=off SDES-off ICE=remove RTP/AVP");

t_on_reply("REPLY_TO_WS");

}

else {

xlog("L_INFO", "This is a classic phone call");

rtpengine_manage("replace-origin replace-session-connection");

t_on_reply("MANAGE_CLASSIC_REPLY");

}

}

onreply_route[REPLY_TO_WS] {

xlog("L_INFO", "Reply from softphone: $rs");

if (t_check_status("183")) {

change_reply_status("180", "Ringing");

remove_body();

exit;

}

if(!(status=~"[12][0-9][0-9]"))

return;

# rtpengine_manage("froc+SP");

xlogl("L_INFO","Fixing ICE/SAVPF Parameters");

rtpengine_manage("rtcp-mux-offer generate-mid DTLS=passive SDES-off ICE=force RTP/SAVPF");

}

onreply_route[REPLY_FROM_WS] {

xlog("L_INFO", "Reply from webrtc client: $rs");

if(status=~"[12][0-9][0-9]") {

rtpengine_manage("force trust-address replace-origin replace-session-connection ICE=remove RTP/AVP");

# rtpengine_manage("froc-sp");

route(NATMANAGE);

}

}

onreply_route[MANAGE_CLASSIC_REPLY] {

xlog("L_INFO", "Boring reply from softphone: $rs");

if(status=~"[12][0-9][0-9]") {

rtpengine_manage("replace-origin replace-session-connection");

# rtpengine_manage("co");

route(NATMANAGE);

}

}

onreply_route[REPLY_WS_TO_WS] {

        xlog("L_INFO", "WS to WS");

        if(status=~"[12][0-9][0-9]") {

        rtpengine_manage("force trust-address replace-origin replace-session-connection ICE=force");

                route(NATMANAGE);

        }

}

Thank you.