[OpenSIPS-Users] OpenSIPS error Malformed Header/failed to generate a HBH ACK

[Liviu Chircu]

Useful update: The actual culprit is the initial INVITE from the SIP 
trunk, which is missing the "From" header. FreeSWITCH raises an eyebrow 
and replies with 400 "Bad Request", while omitting the header as well on 
the way back to OpenSIPS!

Liviu Chircu
OpenSIPS Developer
http://www.opensips-solutions.com

On 16.03.2016 11:27, Liviu Chircu wrote:
> Hi Dimitry!
>
> That errors suggests the "From" Header Field of the 400 negative reply 
> is missing! Best way to continue from here is to perform a SIP trace 
> on this scenario, so you can confirm this yourself before starting to 
> fix it.
> Liviu Chircu
> OpenSIPS Developer
> http://www.opensips-solutions.com
> On 15.03.2016 14:48, Nagorny, Dimitry wrote:
>>
>> Good afternoon Ladies and Gentlemen,
>>
>> I’m trying to use OpenSIPS as a Border Controller between a PSTN and 
>> a FreeSWITCH. The PSTN is sending all SIP-messages through a SIP-trunk.
>>
>> I got OpenSIPS working fine from PSTN through OpenSIPS to FreeSWITCH, 
>> but the other way around (from FS over OpenSIPS to PSTN),  I’m 
>> getting an error message I can’t solve. (Info: There are NO phones 
>> registered with OpenSIPS or FreeSWITCH, they are all on the PSTN, I 
>> need OpenSIPS only to guide traffic to either my FreeSWITCH 
>> mediaserver or tot he Aus @ PBX.)
>>
>> As far as I can tell, when OpenSIPS opens up a new branch it is 
>> changing internally the headers from the incoming SIP-message from 
>> FreeSWITCH into a wrong format and after that it’s throwing two errors:
>>
>> -ERROR:tm:send_ack: failed to generate a HBH ACK if key HFs in reply 
>> missing
>> ERROR:tm:reply_received: failed to send ACK (local=no)
>>
>> oHere I looked at the relevant code but I can’t tell what it is 
>> trying to do in the transaction module
>>
>> oAs well I couldn’t find info about the abbreviation „HBH“ or „HF“
>>
>> Additionally this piece of info:
>>
>> -… SIP/2.0 400 Bad Request..Warning: 399 192.168.1.30 "Malformed 
>> headers : From " …
>>
>> oFrom this somehow I found out that it’s missing the “:“ after From
>>
>> Please see the attached files for more info.
>> I would very much appreciate it if somebody could give me, at least, 
>> a hint how I could fix the problem, because by now I googled these 
>> problems for three days now w/o a solution. I can’t attach the full 
>> debug, the mail list blocks the size of it (17KB…). I’ll attach it to 
>> an answer.
>>
>> Thanks in advance for any help I can get!
>>
>> Very Respectfully
>>
>> *Dimitry Nagorny*
>>
>> Trainee
>>
>> robot5GmbH
>>
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