Hello,

it would be useful to know also the version of kamailio that is run there. The latest release series should have a safety check in order to prevent setting an invalid restored From/To URI.

On the other hand, if the UA doesn't preserve the From/To, then it doesn't require to be unchanged, so the update (without auto restore) of the From/To can be done only for initial INVITE, when UA takes the caller/callee ids. For requests within the dialog, these headers can be left unchanged or changed to something like anonymous@anonymous.invalid

The last option here, which is the safest, is to use dialog module together with uac, so uac module stores the From/To values inside the dialog and restores them from there, instead of relying on record-routing and the masking algorithm for values.

Cheers,
Daniel

Hello,

It looks like headers "From" in initial INVITE and received message are different.

For example:

 in INVITE : <sip:useragent7122@kamailio_address:5068>

 in received message : <sip:useragent7122@kamailio_address>

When you use header "From" transformation (I see Route with vsf), restore may be correct only for exactly the same header "From".

Check may be port number is missing/added in  received message header "From".

Best regards,

Julia

On Mon, Nov 13, 2017 at 5:05 PM, Donat Zenichev <donat.zenichev@gmail.com> wrote:

Hi community.

We experience the problem with malformed messages.

First of all, I want to say, that most of time kamailio works well and nothing happens that can drop sessions.

But from time-to-time something changes (may be in the network) and kamailio receives requests with malformed headers (To or From hfs).

The schema:

uplinks -> kamailio <-> routing server (asterisk)

Malformed messages were received only from asterisk server.
Sip debug on asterisk showed that messages were transmitted correctly and headers were nice.

But kamailio obtains changed (broken) packets or perhaps can't read them properly.

How does it look like:

Nov 10 12:37:06 kamailio-name kamailio[965]: INFO: <script>: Going to NATMANAGE for BYE from sip:useragent7122@kamailio_address:5068 (IP=wss:client_address:62881) - R=sip:dialed_did_service@asterisk_address:50600 ID=1b0044070de406153bf0e4b84d6bb793@asterisk_address:50600

Nov 10 12:37:06 kamailio-name kamailio[965]: NOTICE: <script>: Relaying request to <null> - R=sip:dialed_did_service@asterisk_address:50600 ID=1b0044070de406153bf0e4b84d6bb793@asterisk_address:50600

Nov 10 12:37:06 kamailio-name kamailio[965]: ERROR: <core> [parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: [<sip:useragent6] .

Nov 10 12:37:06 kamailio-name kamailio[965]: ERROR: <core> [parser/parse_from.c:75]: parse_from_header(): bad From header [<sip:useragent6<+.w>;tag=jja7l45gd1]

Nov 10 12:37:06 kamailio-name kamailio[965]: ERROR: dialog [dlg_cseq.c:89]: dlg_cseq_prepare_msg(): cannot parse FROM header

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: [<sip:useragent6] .

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_from.c:75]: parse_from_header(): bad From header [<sip:useragent6<+.w>;tag=jja7l45gd1]

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: dialog [dlg_cseq.c:89]: dlg_cseq_prepare_msg(): cannot parse FROM header

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: [<sip:useragent6] .

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_from.c:75]: parse_from_header(): bad From header [<sip:useragent6<+.w>;tag=jja7l45gd1]

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: uac [replace.c:783]: restore_uris_reply(): failed to find/parse FROM hdr

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: [<sip:useragent6] .

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_from.c:75]: parse_from_header(): bad From header [<sip:useragent6<+.w>;tag=jja7l45gd1]

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: pv [pv_core.c:465]: pv_get_from_attr(): cannot parse From header

Nov 10 12:37:06 kamailio-name kamailio[937]: INFO: <script>: Skip manage DEVICE_STATE for BYE from <null> (IP=udp:asterisk_address:50600) with (200 - OK) - R=<null> ID=1b0044070de406153bf0e4b84d6bb793@asterisk_address:50600

Nov 10 12:37:06 kamailio-name kamailio[937]: INFO: <script>: ------------------------------------MANAGE BYE by DEVICE_STATE_BYE_MANAGE route - 200 - OK M=BYE IP=udp:asterisk_address:50600 ID=1b0044070de406153bf0e4b84d6bb793@asterisk_address:50600

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: [<sip:useragent6] .

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_from.c:75]: parse_from_header(): bad From header [<sip:useragent6<+.w>;tag=jja7l45gd1]

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: pv [pv_core.c:465]: pv_get_from_attr(): cannot parse From header

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: [<sip:useragent6] .

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_from.c:75]: parse_from_header(): bad From header [<sip:useragent6<+.w>;tag=jja7l45gd1]

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: rtpengine [rtpengine_funcs.c:331]: get_from_tag(): failed to parse From header

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: rtpengine [rtpengine.c:2252]: rtpp_function_call(): can't get From tag

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: [<sip:useragent6] .

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_from.c:75]: parse_from_header(): bad From header [<sip:useragent6<+.w>;tag=jja7l45gd1]

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: pv [pv_core.c:465]: pv_get_from_attr(): cannot parse From header

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_addr_spec.c:719]: parse_addr_spec(): unexpected char [<] in status 6: [<sip:useragent6] .

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: <core> [parser/parse_from.c:75]: parse_from_header(): bad From header [<sip:useragent6<+.w>;tag=jja7l45gd1]

Nov 10 12:37:06 kamailio-name kamailio[937]: ERROR: pv [pv_core.c:465]: pv_get_from_attr(): cannot parse From header

How the packet looks like:

ACK sip:tt7etmau@bb0pd5t63b26.invalid;alias=client_address~57573~6;transport=ws SIP/2.0

Via: SIP/2.0/UDP asterisk_address:50600;branch=z9hG4bK117106ca;rport

Route: <sip:kam2.domain.com:5068;nat=yes;transport=udp;r2=on;ftag=as06869a5d;lr=on;vsf=AAAAAEZZSVVDVV1VRBlUUkUpFQxdVUZYXiRCHU1RQl1HRVNaXhhAQ3RuLnR3aWxpby5jb20-;vst=AAAAAAAAAAAAAAAAAAAAAAAfBwQRQE8NBR9BChIFAwddCgADFEVDQlYudHdpbGlvLmNvbQ--;did=b0c.7331>,<sip:kam2.callision.com:5068;nat=yes;transport=ws;r2=on;ftag=as06869a5d;lr=on;vsf=AAAAAEZZSVVDVV1VRBlUUkUpFQxdVUZYXiRCHU1RQl1HRVNaXhhAQ3RuLnR3aWxpby5jb20-;vst=AAAAAAAAAAAAAAAAAAAAAAAfBwQRQE8NBR9BChIFAwddCgADFEVDQlYudHdpbGlvLmNvbQ--;did=b0c.7331>

Max-Forwards: 70

From: "19172423539" <sip:19172423539@asterisk_address:50600>;tag=as06869a5d

To: <sip:useragent7122@10.0.1.18:5068>;tag=nmv7kmpau3

Contact: <sip:19172423539@asterisk_address:50600>

Call-ID: 629d5a132c194c536b5f5c1a2a3c6e32@asterisk_address:50600

CSeq: 102 ACK

User-Agent: asterisk PBX

Content-Length: 0

The transport is used to send messages between asterisk and kamailio is TCP.

TCP configurations:

tcp_connection_lifetime=3604

tcp_accept_no_cl=yes

tcp_connect_timeout=5

tcp_send_timeout=5

tcp_rd_buf_size=16384

tcp_keepalive=yes

tcp_crlf_ping=yes

tcp_keepcnt=3

tcp_keepidle=30

tcp_keepintvl=15

tcp_max_connections=4096 

I found the idea, that we need to change following parameters:

modparam("uac","restore_mode","auto")

modparam("uac","restore_dlg",1)

to:

modparam("uac","restore_mode","none")

modparam("uac","restore_dlg",0)

I did that, now it looks like all is fine, but I think it can get back.

Thanks in advance.

--

-- 
BR, Donat Zenichev
Wnet VoIP team
Tel Ukraine:  +380(44) 5-900-800
Tel USA: +164(67) 8-174-17
https://w-net.us/

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Daniel-Constantin Mierla
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Kamailio Advanced Training, Nov 13-15, 2017, in Berlin - www.asipto.com
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