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9 Replies Last post: Aug 11, 2007 9:48 PM by Guest  
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madar
7 posts since
Aug 8, 2007

Aug 8, 2007 4:16 AM

OpenSBC ACK problem

Hi,

I''m using opensbc to connect our IMS and other SIP systems. Opensbc used in b2bua mode with rtp proxy.
Now every call goes through opensbc. It works fine, but I have a problem now.
When user1 calls user2 and the connection estabilished user1 sends an ACK message, but the sbc cannot forward it.

Here are the details:
USER1 -> OPENSBC SIP/SDP Request: INVITE sip:2222@mik.bme.hu
OPENSBC -> USER1 SIP Status: 100 Trying
OPENSBC -> USER2-IMS-I-CSCF SIP/SDP Request: INVITE sip:2222@mik.bme.hu
USER2-IMS-I-CSCF -> OPENSBC SIP Status: 100 Trying
USER2-IMS-I-CSCF -> OPENSBC SIP Status: 180 Ringing
OPENSBC -> USER1 SIP Status: 180 Ringing
USER2-IMS-I-CSCF -> OPENSBC SIP/SDP Status: 200 OK
OPENSBC -> USER1 SIP/SDP Status: 200 OK
USER1 -> OPENSBC SIP Request: ACK sip:OPENSBC:5060
USER2-IMS-I-CSCF -> OPENSBC SIP/SDP Status: 200 OK
USER2-IMS-I-CSCF -> OPENSBC SIP/SDP Status: 200 OK
USER2-IMS-S-CSCF -> OPENSBC SIP Request: BYE sip:OPENSBC:5060
OPENSBC -> USER2-IMS-S-CSCF SIP Status: 200 OK
OPENSBC -> USER1 SIP Request: BYE sip:user1@OPENSBC:43760
USER1 -> OPENSBC SIP Status: 200 OK

OpenSBC logs says the following:
DBG: CID=0x0e62 RCV: enc=0 490 Bytes from RCVADDR: 80.98.72.216:RCVPORT: 57474:UDP (ACK sip:152.66.87.200:5060 SIP/2.0)
329591:19:39.482 DBG: CID=0x0e62
329591:19:39.482 DBG: CID=0x0e62 RECEIVE: REQ: ACK (1)
329591:19:39.482 DBG: CID=0x0e62 FROM: sip:test01@valami.hu
329591:19:39.482 DBG: CID=0x0e62 TO: sip:laci@mik.bme.hu
329591:19:39.482 DBG: CID=0x0e62 XOR: FALSE
329591:19:39.482 DBG: CID=0x0e62 SRC: 80.98.72.216 PORT: 57474
329591:19:39.482 DBG: CID=0x0e62
329591:19:39.482 DBG: CID=0x0e62 Unable to find ACK Transaction M2I2YzE0ZjlhYjJjNDVkYjVhN2JmODQ5NzY0NmMyMWI.86b1da53aa43dc118f9086ad22c1c4a5|z9hG4bK-
329591:19:39.482 DBG: CID=0x0e62
329591:19:39.482 DBG: CID=0x0e62 *** TRANSACTION DOES NOT EXIST ***
329591:19:39.482 DBG: CID=0x0e62 Message: ACK sip:152.66.87.200:5060 SIP/2.0
329591:19:39.482 DBG: CID=0x0e62 Call-Id: M2I2YzE0ZjlhYjJjNDVkYjVhN2JmODQ5NzY0NmMyMWI.
329591:19:39.482 DBG: CID=0x0e62
329591:19:39.482 INF: CID=0x0e62 Event: Setting UA Core Call to handle event ACK
329591:19:39.482 DTL: CID=0x0e62 Event: ---> UnknownTransaction - ACK

The IMS hungup the call after 30 sec, because it doeasn''t get the ACK message.
Is it an opensbc bug or my configuration are wrong? I can provide more logs and traces if it''s necessary.

Thanks
madar @ Mobile Innovation Centre
Guest
Guest
1. Aug 8, 2007 4:28 AM in response to: madar
Re: [OpenSBC] OpenSBC ACK problem
madar wrote:
Hi,

I''m using opensbc to connect our IMS and other SIP systems. Opensbc used in b2bua mode with rtp proxy.
Now every call goes through opensbc. It works fine, but I have a problem now.
When user1 calls user2 and the connection estabilished user1 sends an ACK message, but the sbc cannot forward it.

In B2BUA mode, ACK is generated independently by OpenSBC towards UA 2.
SBC will not forward the ACK sent by UA 1. If you are saying that
OpenSBC is NOT generating an ACK at all, then this is definitely a
bug. If you feel that this is the case, please open a bug report in
bugs.opensourcesip.org and upload the level 5 b2bua log in the bug
report. If possible, include an ethereal capture taken from opensbc
box as well. Make sure that you have the latest code from CVS for your
tests.

Here are the details:
USER1 -> OPENSBC SIP/SDP Request: INVITE sip:2222@mik.bme.hu
OPENSBC -> USER1 SIP Status: 100 Trying
OPENSBC -> USER2-IMS-I-CSCF SIP/SDP Request: INVITE sip:2222@mik.bme.hu
USER2-IMS-I-CSCF -> OPENSBC SIP Status: 100 Trying
USER2-IMS-I-CSCF -> OPENSBC SIP Status: 180 Ringing
OPENSBC -> USER1 SIP Status: 180 Ringing
USER2-IMS-I-CSCF -> OPENSBC SIP/SDP Status: 200 OK
OPENSBC -> USER1 SIP/SDP Status: 200 OK
USER1 -> OPENSBC SIP Request: ACK sip:OPENSBC:5060
USER2-IMS-I-CSCF -> OPENSBC SIP/SDP Status: 200 OK
USER2-IMS-I-CSCF -> OPENSBC SIP/SDP Status: 200 OK
USER2-IMS-S-CSCF -> OPENSBC SIP Request: BYE sip:OPENSBC:5060
OPENSBC -> USER2-IMS-S-CSCF SIP Status: 200 OK
OPENSBC -> USER1 SIP Request: BYE sip:user1@OPENSBC:43760
USER1 -> OPENSBC SIP Status: 200 OK

OpenSBC logs says the following:
DBG: CID=0x0e62 RCV: enc=0 490 Bytes from RCVADDR: 80.98.72.216:RCVPORT: 57474:UDP (ACK sip:152.66.87.200:5060 SIP/2.0)
329591:19:39.482 DBG: CID=0x0e62
329591:19:39.482 DBG: CID=0x0e62 RECEIVE: REQ: ACK (1)
329591:19:39.482 DBG: CID=0x0e62 FROM: sip:test01@valami.hu
329591:19:39.482 DBG: CID=0x0e62 TO: sip:laci@mik.bme.hu
329591:19:39.482 DBG: CID=0x0e62 XOR: FALSE
329591:19:39.482 DBG: CID=0x0e62 SRC: 80.98.72.216 PORT: 57474
329591:19:39.482 DBG: CID=0x0e62
329591:19:39.482 DBG: CID=0x0e62 Unable to find ACK Transaction M2I2YzE0ZjlhYjJjNDVkYjVhN2JmODQ5NzY0NmMyMWI.86b1da53aa43dc118f9086ad22c1c4a5|z9hG4bK-
329591:19:39.482 DBG: CID=0x0e62
329591:19:39.482 DBG: CID=0x0e62 *** TRANSACTION DOES NOT EXIST ***
329591:19:39.482 DBG: CID=0x0e62 Message: ACK sip:152.66.87.200:5060 SIP/2.0
329591:19:39.482 DBG: CID=0x0e62 Call-Id: M2I2YzE0ZjlhYjJjNDVkYjVhN2JmODQ5NzY0NmMyMWI.
329591:19:39.482 DBG: CID=0x0e62
329591:19:39.482 INF: CID=0x0e62 Event: Setting UA Core Call to handle event ACK
329591:19:39.482 DTL: CID=0x0e62 Event: ---> UnknownTransaction - ACK


This log is normal. Since IST transactions are terminated upon sending
the inital 200 OK.

The IMS hungup the call after 30 sec, because it doeasn''t get the ACK message.
Is it an opensbc bug or my configuration are wrong? I can provide more logs and traces if it''s necessary.

Thanks
madar @ Mobile Innovation Centre
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madar
7 posts since
Aug 8, 2007
2. Aug 8, 2007 7:36 AM in response to: Guest
Re: [OpenSBC] OpenSBC ACK problem
Thank you for the quick respose. I''ll create ethereal capture and debug.

madar
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madar
7 posts since
Aug 8, 2007
3. Aug 8, 2007 7:49 AM in response to: Guest
Re: [OpenSBC] OpenSBC ACK problem
Hi,

I tried to open a bug report at bug.opensourcesip.org, but it''s under maintenance.
I uploaded the ethereal (wireshark) capture and the level 5 log:
http://home.mik.bme.hu/~madarassy/opensbc-bugreport.zip

Thanks,
madar
Guest
Guest
4. Aug 9, 2007 11:38 AM in response to: madar
Re: [OpenSBC] OpenSBC ACK problem
Hi Madar,

I have looked at your logs and it is true that ACK is not sent for the
200 OK. I am going to need your help. I have put more traces around
the SendACK method to know where it fails. Would you be able to
recompile from CVS and send me the new logs?

madar wrote:

Hi,

I tried to open a bug report at bug.opensourcesip.org, but it''s under maintenance.
I uploaded the ethereal (wireshark) capture and the level 5 log:
http://home.mik.bme.hu/~madarassy/opensbc-bugreport.zip

Thanks,
madar
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madar
7 posts since
Aug 8, 2007
5. Aug 10, 2007 3:23 AM in response to: Guest
Re: [OpenSBC] OpenSBC ACK problem
Hi Joegen,

Thank you for your help, I upgrade to the latest CVS build and upload the trace.

madar
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madar
7 posts since
Aug 8, 2007
6. Aug 10, 2007 3:45 AM in response to: Guest
Re: [OpenSBC] OpenSBC ACK problem
Hi,

I uploaded the new debug log and wireshark traces here:
http://home.mik.bme.hu/~madarassy/opensbc-bugreport1.zip

Best regards,
madar
Guest
Guest
7. Aug 10, 2007 8:56 AM in response to: madar
Re: [OpenSBC] OpenSBC ACK problem
Hi Madar,

Here is there the Route that needs to be traversed by the ACK

Route:
<sip:scscf.mik.bme.hu:5060;lr;Role=2;Dpt=2894-2;Si=1618;So=1619;LCMID=O;X-HwCsfCookie=2408>

Question: Does scscf.mik.bme.hu have a DNS entry? Would it be
resolvable via normal DNS query? I am suspecting that the transport
was not able to resolve this to an actual IP address and it is dropping
the ACK.

If this is not a FQDN or DNS/SRV you need to tell SBC to map the dummy
domain to an actual IP Address.

Look for the section in the admin pages named "Internal DNS Mapping"
and add the entry

sip:scscf.mik.bme.hu sip:10.0.1.2

This should solve your ACK problem. Let me know

madar wrote:

Hi,

I uploaded the new debug log and wireshark traces here:
http://home.mik.bme.hu/~madarassy/opensbc-bugreport1.zip

Best regards,
madar
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madar
7 posts since
Aug 8, 2007
8. Aug 10, 2007 6:50 PM in response to: Guest
Re: [OpenSBC] OpenSBC ACK problem
Dear Joegen,

Thank you for your help. The problem was what you suspected. The dns mapping was missing for scscf.mik.bme.hu (I added only mik.bme.hu).

Now opensbc works fine between our IMS and SIP systems!

Best regards,
madar
Guest
Guest
9. Aug 11, 2007 9:48 PM in response to: madar
Re: [OpenSBC] OpenSBC ACK problem
Hi Madar,

I am interested in adding SIP->IMS B2BUA functionalities in OpenSBC .
What''s the exact function of OpenSBC in you setup? Are you active in
the development of OpenIMS?

Joegen

madar wrote:
Dear Joegen,

Thank you for your help. The problem was what you suspected. The dns mapping was missing for scscf.mik.bme.hu (I added only mik.bme.hu).

Now opensbc works fine between our IMS and SIP systems!

Best regards,
madar

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