Problem with Mulipart SDP

[Earn330]

Hi

We need to transfer SIP messages with multipart content through the SEMS SBC module for transfering geolocation in combination with emergency calls. Although i can not find any reason why it does not work the complete sdp part is dropped. I get an error that claims, that the mime body can't be parsed
Is it possible to give you the debug log in a private channel as there a sensible data in it and it doesn't make sense to delete them as i have to delete them all ;)

BR, Björn

[juha-h]

Earn330 writes:

We need to transfer SIP messages with multipart content through the SEMS SBC module for transfering geolocation in combination with emergency calls. Although i can not find any reason why it does not work the complete sdp part is dropped. I get an error that claims, that the mime body can't be parsed Is it possible to give you the debug log in a private channel as there a sensible data in it and it doesn't make sense to delete them as i have to delete them all ;)

In theory sems is able to parse multipart bodies. What is your Content-Type in headers and in each part?

[Earn330]

I will put an Invite here where I leave out sensible stuff. Please keep in mind, that this Invite is simplified.

INVITE sip:+49ddddddddd@x.x.x.x:5060 SIP/2.0
From: <sip:nnnnnnnn@domain.de>;tag=6DA2C9E877C08A8D
To: <sip:dddd@x.x.x.x>
Call-ID: 187782822C24B596@x.x.x.x
CSeq: 10635 INVITE
Contact: <sip:nnnnnnnn-pjhq8ddet3tu9@x.x.x.x:5060;transport=udp>
Privacy: none
Max-Forwards: 68
Expires: 120
Allow-Events: telephone-event,refer
Allow: INVITE,ACK,OPTIONS,CANCEL,BYE,UPDATE,PRACK,INFO,SUBSCRIBE,NOTIFY,REFER,MESSAGE,PUBLISH
Accept: application/sdp, multipart/mixed
Accept-Encoding: identity
Content-Length: 1489
Geolocation: <cid:+49nnnnnnnnn@domain.de>
Content-Type: multipart/mixed;boundary="unique-boundary-1"
Mime-Version: 1.0
P-App-Name: sbc
P-App-Param: profile=out

--unique-boundary-1
Content-Type: application/sdp

v=0
o=user 1090551538 1177155 IN IP4 x.x.x.x
s=call
c=IN IP4 x.x.x.x
t=0 0
m=audio 27292 RTP/AVP 9 8 0 2 102 100 99 101
a=rtpmap:2 G726-32/8000
a=rtpmap:102 G726-32/8000
a=rtpmap:100 G726-40/8000
a=rtpmap:99 G726-24/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=ptime:20

--unique-boundary-1
Content-Type: application/pidf+xml

Content-ID: <cid:+49nnnnnnnnn@domain.de>
<?xml version="1.0" encoding="UTF-8"?>
.
.
.
.
Lots of xml stuff I can't post in public
.
.
.
.

--unique-boundary-1--

[juha-h]

What exactly is the error message telling that the mime body cannot be parsed?

[Earn330]

Hi

this is what I get from debug log

Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parse_sip_uri, parse_uri.cpp:338] DEBUG:  Converted URI port (5060) to int (5060)
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parse_via_params, parse_via.cpp:521] DEBUG:  parsed branch: z9hG4bKbf33.891e425fe0128b176fe65b56975b9c46.0
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parse_via_params, parse_via.cpp:544] DEBUG:  has_rport: 0
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [match_request, trans_table.cpp:99] DEBUG:  Matching INVITE request
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parse_sip_uri, parse_uri.cpp:338] DEBUG:  Converted URI port (5060) to int (5060)
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parseParams, AmMimeBody.cpp:302] DEBUG:  parsed new content-type parameter: <boundary>=<"boundary1">
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parse, AmMimeBody.cpp:586] DEBUG:  parsing multi-part body
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parseMultipart, AmMimeBody.cpp:545] DEBUG:  unexpected end-of-buffer
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [sip_msg2am_request, SipCtrlInterface.cpp:603] DEBUG:  could not parse MIME body
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [handle_sip_request, SipCtrlInterface.cpp:765] DEBUG:  Received new request from <192.168.253.77:5060/udp> on intf #0
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [handleSipMsg, AmSipDispatcher.cpp:105] DEBUG:  method: `INVITE' [6].
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [getActiveProfileMatch, SBC.cpp:282] DEBUG:  active profile = out
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [getActiveProfileMatch, SBC.cpp:294] DEBUG:  using call profile 'out' (from matching active_profile rule '$(paramhdr)')
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [AmSession, AmSession.cpp:87] DEBUG:  dlg = 0x7f62b4003bb0
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [setOAEnabled, AmSipDialog.cpp:210] DEBUG:  enabling offer_answer on SIP dialog ''
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [setRel100State, AmSipDialog.cpp:204] DEBUG:  setting 100rel state for '' to 3
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [setLocalTag, AmSession.cpp:223] DEBUG:  AmSession::setLocalTag() - session id set to 12E90F35-5D11CCF80009E66C-D70CE700
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [startSessionUAS, AmSessionContainer.cpp:297] INFO:  Starting UAS session 12E90F35-5D11CCF80009E66C-D70CE700
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [postEvent, AmEventQueue.cpp:54] DEBUG:  AmEventQueue: trying to post event
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [postEvent, AmEventQueue.cpp:70] DEBUG:  AmEventQueue: event posted
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [handle_sip_request, SipCtrlInterface.cpp:789] DEBUG:  ^^ M [76092B2B2C1096C3@217.70.195.35|] Ru SIP request INVITE handled ^^
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d55b3700] [_start, AmThread.cpp:74] DEBUG:  Thread 140062463047424 is starting.
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d55b3700] [run, AmSession.cpp:261] DEBUG:  startup session
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d55b3700] [run, AmSession.cpp:265] DEBUG:  running session event loop
Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d55b3700] [processingCycle, AmSession.cpp:347] DEBUG:  vv S [|12E90F35-5D11CCF80009E66C-D70CE700] Disconnected, running, 0 UACTransPending, 0 usages vv

[juha-h]

Earn330 writes:

this is what I get from debug log ``` Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parseParams, AmMimeBody.cpp:302] DEBUG: parsed new content-type parameter: <boundary>=<"boundary1"> Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parse, AmMimeBody.cpp:586] DEBUG: parsing multi-part body Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [parseMultipart, AmMimeBody.cpp:545] DEBUG: unexpected end-of-buffer Jun 25 09:27:52 voip-lab-proxy02 sems[12725]: [#7f62d70ce700] [sip_msg2am_request, SipCtrlInterface.cpp:603] DEBUG: could not parse MIME body

In the example you gave earlier, content-type boundary param has value "unique-boundary-1", but the debug indicates that sems found boundary value "boundary1". Can you check what the boundary value was in the request of the debug or create a new debug? It is a bit hard to believe that sems would have such a bug in parsing the boundary param value. I cannot debug this myself, since I don't have any SIP UA available that generates multipart/mixed bodies. You can try yourself to add more debug statements to AmMimeBody.cpp to find where the bug is (if there is any).

[juha-h]

I used sipp to generate multipart/mixed body and got the same "could not parse MIME body" error. I don't myself have need for multipart bodies and therefore lack motivation to start debugging the issue. If you find where the bug is, please create a pull request.

[Earn330]

Unfortunately I'm not able to fix this. If I could do it on my own, I would not have opened an issue here.