Hi, Just letting you all know that I've managed to get the PBX to send the BYE to the SBC and it is now forwarding on to MS (although MS are not sending a reply but we have opened a case for this).
What I did was to comment out the advertised_address to stop advertising the sbc01.froneri.com address globally, then only advertised it on the TLS listener: alias=tls:sbc01.froneri.com:5061 #alias=udp:sbc01.froneri.com:5060 #alias=tcp:sbc01.froneri.com:5060 listen=udp:10.11.250.3:5060 listen=tcp:10.11.250.3:5060 listen=tls:10.11.250.3:5061 as sbc01.froneri.com:5061 #advertised_address=sbc01.froneri.com Cheers Chris From: Chris Johnson Sent: 03 July 2020 12:49 To: [email protected] Subject: Opensips MS Teams lost BYE Hi, I am wondering if someone can please help us? We are struggling to get the BYE packet to go back to MS Teams when the call is initiated by Teams. Our setup is as follows: MS Teams < --- > SBC External 64.x.x.x < --- > SBC Internal 10.11.250.3 < --- > FreePBX (internal only) 10.11.250.1 < --- > SIP Provider < --- > Mobile (external number) Now we are getting calls routed both ways with audio. The problem when the MS Teams calls the Mobile and the Mobile ends the call, the BYE doesn't go back to MS Teams and FreePBX looks like it tries to send the BYE to the external IP address of the SBC, instead of via the internal then external. This is what happens the mobile ends the call and the BYE packet is routed as follows: Mobile --- > SIP Provider --- > FreePBX 10.11.250.1 ---> SBC External 64.x.x.x ---> LOST How do we get the BYE packet to route correctly back through the SBC and onto MS? Thanks Chris Here is our script if that helps: /* comment the next line to enable the auto discovery of local aliases based on reverse DNS on IPs */ auto_aliases=no alias=tls:sbc01.froneri.com:5061 alias=udp:sbc01.froneri.com:5060 alias=tcp:sbc01.froneri.com:5060 #alias=tls:62.54.11.4:5061 listen=udp:10.11.250.3:5060 #as 62.54.11.41 listen=tcp:10.11.250.3:5060 #as 62.54.11.41 listen=tls:10.11.250.3:5061 #as 62.54.11.41 # listen=hep_tcp:10.11.250.3:9060 #advertised_address=62.54.11.4 advertised_address=sbc01.froneri.com #### NAT module loadmodule "nathelper.so" modparam("nathelper", "natping_interval", 10) modparam("nathelper", "ping_nated_only", 1) modparam("nathelper", "sipping_bflag", "SIP_PING_FLAG") modparam("nathelper", "sipping_from", "sip:[email protected]") #CUSTOMIZE ME modparam("nathelper", "received_avp", "$avp(received_nh)") ####### Routing Logic ######## # main request routing logic route{ #sip_trace("tid"); force_rport(); if (nat_uac_test("23")) { if (is_method("REGISTER")) { fix_nated_register(); setbflag(NAT); } else { fix_nated_contact(); setflag(NAT); } } if (!mf_process_maxfwd_header("10")) { sl_send_reply("483","Too Many Hops"); exit; } if(is_method("OPTIONS")) { # xlog("L_INFO", "[MS TEAMS] OPTIONS In\n"); set_advertised_address("62.54.11.41"); set_advertised_port("5061"); sl_send_reply("200", "OK"); exit; } # CANCEL processing if (is_method("CANCEL")) { if (t_check_trans()) sip_trace("tid"); t_relay(); exit; } # absorb retransmissions, but do not create transaction t_check_trans(); if (has_totag()) { sip_trace("tid"); # handle hop-by-hop ACK (no routing required) if ( is_method("ACK") && t_check_trans() ) { xlog("[INFO] has totag & transaction id ACK pass straight out RURI=$ruri, SI=$si, M=$rm\n"); t_relay(); exit; } # sequential request within a dialog should # take the path determined by record-routing if(is_method("INVITE") && !check_source_address("0")) { xlog("[INFO] In dialog Method=$rm, RURI=$ruri, SI=$si ,DU=$du\n"); xlog("[ROUTE] t_relay Route SIP Message \n$mb\n"); t_relay(); } if ( !loose_route() ) { # we do record-routing for all our traffic, so we should not # receive any sequential requests without Route hdr. sl_send_reply("404", "Not here"); exit; } # route it out to whatever destination was set by loose_route() # in $du (destination URI). #xlog("[INFO] sequential requests Route SIP Message \n$mb\n"); xlog("[INFO] has totag RURI=$ruri, SI=$si, M=$rm\n"); route(relay); exit; } # record routing if (is_method("INVITE") && ! has_totag() && check_source_address("0")) { xlog("[ROUTE] Incoming call from PBX to MS TEAMS: RURI=$ruri, SI=$si, M=$rm\n"); sip_trace("tid"); strip(1); do_routing("1"); #prefix("+49"); record_route_preset("sbc01.froneri.com:5061;transport=tls;r2=on", "10.11.250.3:5060;r2=on"); #record_route_preset("sbc01.froneri.com:5061;transport=tls"); #add_rr_param(";r2=on"); route(relay); } else if (is_method("INVITE") && ! has_totag() && !check_source_address("0")) { sip_trace("tid"); create_dialog(); t_on_reply("handle_nat"); #record_route_preset("10.11.250.3:5060;r2=on", "sbc01.froneri.com:5061;transport=tls;r2=on"); record_route(); xlog("[ROUTE] Incoming call from MS TEAMS to PBX: RURI=$ruri, SI=$si, M=$rm\n"); rewritehostport("10.11.250.1:5060"); force_send_socket(udp:10.11.250.3:5060); route(relay); } if (check_route_param("nat=yes")){ setflag(NAT); #route it out to whatever destination was set by loose_route() #in $du (destination URI). record_route(); route(relay); } record_route(); route(relay); } route[relay] { if (isflagset(NAT)) { add_rr_param(";nat=yes"); } xlog("[ON ROUTE] route[relay]: Method=$rm, RURI=$ruri, SI=$si, M=$rm\n"); if (is_method("INVITE") && ! has_totag() ) { t_newtran(); t_on_reply("handle_nat"); t_on_failure("missed_call"); # if we have an application/sdp on our body, so we execute # the rtpproxy_offer if(has_body("application/sdp")){ xlog("[RTPPROXY] route[relay] we have sdp on this message\n$rm\n"); rtpproxy_offer("co", "62.54.11.4"); } } if(is_method("ACK") && has_body("application/sdp")){ xlog("[RTPPROXY] onreply_route[handle_nat] ACK rtpproxy_answer\n"); rtpproxy_answer("co", "62.54.11.4"); } xlog("[INFO] Method=$rm, RURI=$ruri, SI=$si ,DU=$du\n"); if (!t_relay()) { send_reply("500","Internal Error"); } exit; } branch_route[per_branch_ops] { xlog("[INFO] New branch at $ru\n"); } onreply_route[handle_nat] { xlog("[INFO] onreply_route[handle_nat]: RR=$rr, RS=$rs, SI=$si\n$mb\n"); # we receive a reply, we need to check about application/sdp # on our body, if we have, we answer that if(is_method("ACK") && has_body("application/sdp")){ xlog("[RTPPROXY] onreply_route[handle_nat] ACK rtpproxy_answer\n"); rtpproxy_answer("co", "62.54.11.4"); } if (nat_uac_test("1")){ xlog("[INFO] nat_uac_test=1: RR=$rr, RS=$rs, SI=$si\n$mb\n"); fix_nated_contact(); } if ( isflagset(NAT) && has_body("application/sdp") ){ xlog("[INFO] isflagset[NAT] && has_body sdp RR=$rr, RS=$rs, SI=$si\n$mb\n"); rtpproxy_answer("co", "62.54.11.4"); xlog("incoming reply\n"); } } failure_route[missed_call] { if (t_was_cancelled()) { exit; } } local_route { $var(dst) = "pstnhub.microsoft.com"; if (is_method("OPTIONS") && ($(ru{s.index, $var(dst)}) != NULL)){ set_advertised_address("62.54.11.41"); set_advertised_port("5061"); append_hf("Contact: <sip:sbc01.froneri.com:5061;transport=tls>\r\n"); } }
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