[OpenSIPS-Users] Multiple branches for a single AOR
Liviu Chircu
liviu at opensips.org
Tue Jul 17 08:48:58 EDT 2018
Hi Gerwin,
Inside your failure route, you are always attempting a retry of any
failed request. This logic conflicts with your initial statement that
"The intent is to ensure that the response code gets sent through to
A-party".
Best regards,
Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com
On 17.07.2018 14:35, Gerwin van de Steeg wrote:
> Folks,
>
> I'm trying to narrow down a 482 Merged Request problem on calls from
> one SIP device to another via OpenSIPS 2.4.1. Yealink T41P SIP device
> (A-party), calls via OpenSIPS, to another AOR owned by a Zoiper5
> device (B-party).
> The intent is to ensure that when the B-party rejects the call with a
> 486 Busy Here, that the response code gets sent through to A-party.
> However what I'm seeing is the 486 gets sent to OpenSIPS which ACK's
> it, but doesn't go anywhere from there, and then something causes a
> second invite to be sent from OpenSIPS to the B-party which then
> responds of course with 482 Merged Request.
> The call as it is progressing through the call flow seems to be
> starting a second branch to the AOR (only one SIP device registered
> using UDP per AOR).
>
> What would be causing that second call so that I can eliminate it and
> get to the behaviour I'm expecting. Just using a slightly modified
> residential default config template with websocket support (the
> problem was noticed using SIP.JS but exists also in generic SIP device
> to SIP device calls).
>
> Image containing sngrep of call: https://imgur.com/RCZXkO6
>
> Subscribers are in the form of <username>@<domain>
> With an alias setup for an extension number.
>
> ie.
> alfred.anderson at ... = 552
> alice.bell at ... = 553
>
> excerpt from opensips.cfg
>
> if ($rU==NULL) {
> # request with no Username in RURI
> send_reply("484","Address Incomplete");
> exit;
> }
>
> $acc_extra(src_ip) = $si; # source IP of the request
> $acc_leg(caller) = $fu;
> $acc_leg(callee) = $ru;
>
> # apply DB based aliases
> if (alias_db_lookup("dbaliases")) {
> xlog("Alias lookup success [$fu/$tu/$ru/$ci]");
> }
> else {
> xlog("Alias lookup failure [$fu/$tu/$ru/$ci]");
> }
>
> # do blind callforward lookup
> if (avp_db_load("rU", "$avp(callfwd)")) {
> t_reply("181", "Call Is Being Forwarded");
> $ru = $avp(callfwd);
> xlog("forwarded call to: $avp(callfwd)");
> route(relay);
> exit;
> }
>
> # apply transformations from dialplan table
> dp_translate("0", "$rU/$rU");
>
> # check if the call needs to be routed to freeswitch
> route(freeswitch);
>
> # here we would set the redirect URI if it had one
> route(lookup);
> }
>
> route[lookup] {
> script_trace(1, "$rm from $si, rur=$ru", "me");
> xlog("route:lookup");
> # do lookup with method filtering
> if (!lookup("location","m")) {
> xlog("lookup failure");
> t_newtran();
> if (!db_does_uri_exist()) {
> xlog("$cfg_line: URI doesn't exist");
> send_reply("420", "Bad Extension");
> exit;
> }
> t_reply("404", "Not Found");
> exit;
> }
>
> # when routing via usrloc, log the missed calls also
> do_accounting("db","missed");
>
> route(relay);
> }
>
> route[freeswitch] {
> xlog("route:freeswitch");
> if (!is_method("INVITE")) {
> return;
> }
>
> # if the called number begins with the right dialplan redirect
> it to freeswitch
> # here we take everythign prefixed with a *, strip it, and send
> it to freeswitch
> if ($rU=~"^\*") {
> strip(1);
> $du = "sip:10.23.4.192:50600 <http://10.23.4.192:50600>";
> route(relay);
> }
> }
>
>
> route[relay] {
> xlog("route:relay: Relaying: method=$rm");
> # for INVITEs enable some additional helper routes
> if (is_method("INVITE")) {
> t_on_branch("per_branch_ops");
> t_on_reply("handle_nat");
> t_on_failure("missed_call");
> }
> else if (is_method("BYE|CANCEL")) {
> # cancel the rtpengine transcoding
> rtpengine_delete();
> }
>
> if (!t_relay()) {
> send_reply("500","Internal Error");
> }
> exit;
> }
>
>
> branch_route[per_branch_ops] {
> script_trace(1, "$rm from $si, rur=$ru", "me");
> xlog("[$ci/$T_branch_idx] branch_route:per_branch_ops: new
> branch at $ru\n");
>
> # WebSocket specific handling with NORMAL SDP negotiation
> # assumes SDP offer in the INVITE from the UAC, and SDP
> # answer is in 200 OK from the UAS
> if (!is_method("INVITE") || !has_body("application/sdp"))
> return;
>
> if (isflagset(SRC_WS) && isbflagset(DST_WS))
> $var(rtpengine_flags) = "ICE=force-relay DTLS=passive";
> else if (isflagset(SRC_WS) && !isbflagset(DST_WS))
> $var(rtpengine_flags) = "RTP/AVP
> replace-session-connection replace-origin ICE=remove";
> else if (!isflagset(SRC_WS) && isbflagset(DST_WS))
> $var(rtpengine_flags) = "UDP/TLS/RTP/SAVPF ICE=force";
> else if (!isflagset(SRC_WS) && !isbflagset(DST_WS))
> $var(rtpengine_flags) = "RTP/AVP
> replace-session-connection replace-origin ICE=remove";
>
> # only enable transcoding if websocket call for now
> if (isflagset(SRC_WS) || isbflagset(DST_WS)) {
> rtpengine_offer("$var(rtpengine_flags)");
> }
> }
>
> onreply_route[handle_nat] {
> script_trace(1, "$rm from $si, rur=$ru", "me");
> xlog("[$ci/$T_branch_idx] onreply_route:handle_nat: $ru\n");
>
> # WebSocket specific handling with NORMAL SDP negotiation
> # assumes SDP offer in the INVITE from the UAC, and SDP
> # answer is in 200 OK from the UAS
> if (!has_body("application/sdp"))
> return;
>
> if (isflagset(SRC_WS) && isbflagset(DST_WS))
> $var(rtpengine_flags) = "ICE=force-relay DTLS=passive";
> else if (isflagset(SRC_WS) && !isbflagset(DST_WS))
> $var(rtpengine_flags) = "UDP/TLS/RTP/SAVPF ICE=force";
> else if (!isflagset(SRC_WS) && isbflagset(DST_WS))
> $var(rtpengine_flags) = "RTP/AVP
> replace-session-connection replace-origin ICE=remove";
> else if (!isflagset(SRC_WS) && !isbflagset(DST_WS))
> $var(rtpengine_flags) = "RTP/AVP
> replace-session-connection replace-origin ICE=remove";
>
> # only enable transcoding if websocket call for now
> if (isflagset(SRC_WS) || isbflagset(DST_WS)) {
> rtpengine_answer("$var(rtpengine_flags)");
> }
> }
>
> failure_route[missed_call] {
> script_trace(1, "$rm from $si, rur=$ru", "me");
> xlog("[$ci/$T_branch_idx] failure_route:missed_call: incoming
> failure response to $rm <- $T_reply_code/$T_ruri");
> if (t_was_cancelled()) {
> xlog("[$ci/$T_branch_idx] was cancelled");
> exit;
> }
> do_accounting("db", "missed");
>
> if (!t_relay()) {
> send_reply("500","Internal Error");
> }
> else {
> xlog("[$ci/$T_branch_idx] Relay success
> $rm/$T_reply_code");
> }
> }
>
>
>
>
>
> Cheers,
> Gerwin
>
>
>
>
>
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