TOPOS removes via header
event_route[topos:msg-outgoing] {
# Feature Flag is enabled ** problem occurs here **
if($sht(feature_flags=>kamailio-disable-internal-topos) == "true") {
if(ds_is_from_list(KAM_SET_ID, 3, "sip:$sndto(ip):5060")) {
drop;
}
}
}
Troubleshooting
- verified via exists in original 200 OK REPLY from Freeswitch
- checked wire and verified via header is missing when forwarding 200 OK onward to next kamailio (B) node from Kamailio (A)
Reproduction
Call drop in event route topos:msg-outgoing
- call flow: Freeswitch -> Kamailio A -> Kamailio B -> UAC
- place incoming call into kamailio
- put call on hold / reinvite
Debugging Data
Disabling topos entirely via header is correctly sent from A -> B.
Log Messages (Kamailio B)
2025-02-25T00:19:08.545447+00:00 /usr/sbin/kamailio[3959021]: ERROR: {2 1 INVITE 995df181-4eae-40ae-8225-427ce8252250} <core> [core/receive.c:542]: receive_msg(): no via found in reply
2025-02-25T00:19:09.045917+00:00 /usr/sbin/kamailio[3959037]: ERROR: {2 1 INVITE 995df181-4eae-40ae-8225-427ce8252250} <core> [core/receive.c:542]: receive_msg(): no via found in reply
2025-02-25T00:19:10.046936+00:00 /usr/sbin/kamailio[3958995]: ERROR: {2 1 INVITE 995df181-4eae-40ae-8225-427ce8252250} <core> [core/receive.c:542]: receive_msg(): no via found in reply
2025-02-25T00:19:12.048099+00:00 /usr/sbin/kamailio[3959003]: ERROR: {2 1 INVITE 995df181-4eae-40ae-8225-427ce8252250} <core> [core/receive.c:542]: receive_msg(): no via found in reply
SIP Traffic
reinvite B -> A:
INVITE sip:mod_sofia@54.245.XX.XX:5060 SIP/2.0
Record-Route: <sip:35.161.XX.XX:5060;r2=on;lr;ftag=9vX27Um099jZS;did=a2b.7e62>
Record-Route: <sip:35.161.XX.XX:7443;transport=ws;r2=on;lr;ftag=9vX27Um099jZS;did=a2b.7e62>
Via: SIP/2.0/UDP 35.161.XX.XX:5060;branch=z9hG4bK16be.085d2f3d83e8d939f7f1d3fbc4a5ff09.0
Via: SIP/2.0/WSS 74jssm3ooc66.invalid;received=209.160.251.114;branch=z9hG4bK3968143
To: <sip:9496294444@54.245.XX.XX>;tag=9vX27Um099jZS
From: <sip:Dff742e5340fDd93847e@9e3f4e45-01cf-1f66-8d70-8d14ec555153>;tag=q1vfbk6o6q
CSeq: 1 INVITE
Call-ID: 995df181-4eae-40ae-8225-427ce8252250
Max-Forwards: 69
Allow: ACK,BYE,CANCEL,INFO,INVITE,MESSAGE,NOTIFY,OPTIONS,PRACK,REFER,REGISTER,SUBSCRIBE
Contact: <sip:tu0r7r7u@74jssm3ooc66.invalid;transport=ws>
Supported: outbound
User-Agent: WebPhone/3.1740423483.87
Content-Type: application/sdp
Content-Length: 1538
Route: <sip:34.213.XX.XX:5060;r2=on;lr;ftag=9vX27Um099jZS;did=a2b.1142>,<sip:34.213.XX.XX;r2=on;lr;ftag=9vX27Um099jZS;did=a2b.1142>
P-SR-XUID: atpsh-7cde-67bcbccd-3c68ef-1
v=0
o=- 4757376688759011024 3 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE 0
a=extmap-allow-mixed
a=msid-semantic: WMS 35a33e17-dd80-46fa-afe9-72fdd03d4e41
m=audio 32999 UDP/TLS/RTP/SAVPF 0 102 101 103 63 9 8 13
c=IN IP4 209.160.251.114
a=rtcp:9 IN IP4 0.0.0.0
a=candidate:2845667355 1 udp 2122260223 10.82.226.218 54425 typ host generation 0 network-id 1 network-cost 10
a=candidate:1750280017 1 udp 1686052607 209.160.251.114 32999 typ srflx raddr 10.82.226.218 rport 54425 generation 0 network-id 1 network-cost 10
a=ice-ufrag:Eb9h
a=ice-pwd:nQdfpsILiUI+YKSQT3eZy52x
a=ice-options:trickle
a=fingerprint:sha-256 BA:68:25:D5:66:70:A9:17:38:18:74:0A:B3:C2:3E:F9:3A:A0:7C:5F:18:0F:EB:B7:93:28:86:56:62:23:DF:E5
a=setup:actpass
a=mid:0
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:4 urn:ietf:params:rtp-hdrext:sdes:mid
a=sendonly
a=msid:35a33e17-dd80-46fa-afe9-72fdd03d4e41 57910219-943b-4687-9511-b9a9d0a1ea6f
a=rtcp-mux
a=rtcp-rsize
a=rtpmap:0 PCMU/8000
a=rtpmap:102 opus/48000/2
a=fmtp:102 minptime=10;useinbandfec=1
a=rtpmap:101 telephone-event/8000
a=rtpmap:103 telephone-event/48000
a=rtpmap:63 red/48000/2
a=fmtp:63 102/102
a=rtpmap:9 G722/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:13 CN/8000
a=ssrc:2604971680 cname:YEcJO5XrSKZor1jY
a=ssrc:2604971680 msid:35a33e17-dd80-46fa-afe9-72fdd03d4e41 57910219-943b-4687-9511-b9a9d0a1ea6f
200 OK Freeswitch -> A
SIP/2.0 200 OK
v:SIP/2.0/UDP 34.213.XX.XX:5060;branch=z9hG4bK16be.86ee5e1d4190783bd6a79bd21110d190.0
f:<sip:Dff742e5340fDd93847e@9e3f4e45-01cf-1f66-8d70-8d14ec555153>;tag=q1vfbk6o6q
t:<sip:9496294444@54.245.XX.XX>;tag=9vX27Um099jZS
i:995df181-4eae-40ae-8225-427ce8252250
CSeq:1 INVITE
m:<sip:mod_sofia@54.245.XX.XX:5060>
Accept:application/sdp
Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY,PUBLISH,SUBSCRIBE
k:timer,path,replaces
x:90;refresher=uas
c:application/sdp
Content-Disposition:session
l:284
v=0
o=FreeSWITCH 1740424963 1740424965 IN IP4 54.245.XX.XX
s=FreeSWITCH
c=IN IP4 54.245.XX.XX
t=0 0
m=audio 17776 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=recvonly
a=ptime:20
a=rtcp-mux
a=rtcp:17776 IN IP4 54.245.XX.XX
200 OK A -> B
SIP/2.0 200 OK
f:<sip:Dff742e5340fDd93847e@9e3f4e45-01cf-1f66-8d70-8d14ec555153>;tag=q1vfbk6o6q
t:<sip:9496294444@54.245.XX.XX>;tag=9vX27Um099jZS
i:995df181-4eae-40ae-8225-427ce8252250
CSeq:1 INVITE
m:<sip:mod_sofia@54.245.XX.XX:5060>
Accept:application/sdp
Allow:INVITE,ACK,BYE,CANCEL,OPTIONS,MESSAGE,INFO,UPDATE,REGISTER,REFER,NOTIFY,PUBLISH,SUBSCRIBE
k:timer,path,replaces
x:90;refresher=uas
c:application/sdp
Content-Disposition:session
l:315
v=0
o=FreeSWITCH 1740424963 1740424965 IN IP4 34.211.XX.XX
s=FreeSWITCH
c=IN IP4 34.211.XX.XX
t=0 0
m=audio 20374 RTP/AVP 0 101
a=mid:0
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=recvonly
a=rtcp:20374
a=rtcp-mux
a=ptime:20
a=ice-options:trickle
a=end-of-candidates
Possible Solutions
TBD
Additional Information
- Kamailio Version - output of
kamailio -v
version: kamailio 5.8.2 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, MEM_JOIN_FREE, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, HAVE_RESOLV_RES, TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_SEND_BUFFER_SIZE 262144, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 10.2.1
- Operating System:
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye
I can provide PCAP as well if required. Let me know if additional information is required.
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CrazyTux created an issue